diff --git a/src/Illuminate/Auth/AuthManager.php b/src/Illuminate/Auth/AuthManager.php
index cc23eb8..139f66f 100755
--- a/src/Illuminate/Auth/AuthManager.php
+++ b/src/Illuminate/Auth/AuthManager.php
@@ -4,6 +4,7 @@
 
 use Closure;
 use Illuminate\Contracts\Auth\Factory as FactoryContract;
+use Illuminate\Support\Timebox;
 use InvalidArgumentException;
 
 class AuthManager implements FactoryContract
@@ -120,7 +121,7 @@ public function createSessionDriver($name, $config)
     {
         $provider = $this->createUserProvider($config['provider'] ?? null);
 
-        $guard = new SessionGuard($name, $provider, $this->app['session.store']);
+        $guard = new SessionGuard($name, $provider, $this->app['session.store'], null, new Timebox);
 
         // When using the remember me functionality of the authentication services we
         // will need to be set the encryption instance of the guard, which allows
diff --git a/src/Illuminate/Auth/SessionGuard.php b/src/Illuminate/Auth/SessionGuard.php
index 652835f..a63e187 100644
--- a/src/Illuminate/Auth/SessionGuard.php
+++ b/src/Illuminate/Auth/SessionGuard.php
@@ -20,6 +20,7 @@
 use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Str;
+use Illuminate\Support\Timebox;
 use Illuminate\Support\Traits\Macroable;
 use InvalidArgumentException;
 use RuntimeException;
@@ -88,6 +89,13 @@ class SessionGuard implements StatefulGuard, SupportsBasicAuth
      */
     protected $events;
 
+    /**
+     * The timebox implementation.
+     *
+     * @var \Illuminate\Support\Timebox
+     */
+    protected $timebox;
+
     /**
      * Indicates if the logout method has been called.
      *
@@ -109,17 +117,20 @@ class SessionGuard implements StatefulGuard, SupportsBasicAuth
      * @param  \Illuminate\Contracts\Auth\UserProvider  $provider
      * @param  \Illuminate\Contracts\Session\Session  $session
      * @param  \Symfony\Component\HttpFoundation\Request|null  $request
+     * @param  \Illuminate\Support\Timebox|null  $timebox
      * @return void
      */
     public function __construct($name,
                                 UserProvider $provider,
                                 Session $session,
-                                Request $request = null)
+                                Request $request = null,
+                                Timebox $timebox = null)
     {
         $this->name = $name;
         $this->session = $session;
         $this->request = $request;
         $this->provider = $provider;
+        $this->timebox = $timebox;
     }
 
     /**
@@ -423,13 +434,17 @@ public function attemptWhen(array $credentials = [], $callbacks = null, $remembe
      */
     protected function hasValidCredentials($user, $credentials)
     {
-        $validated = ! is_null($user) && $this->provider->validateCredentials($user, $credentials);
+        return $this->timebox->make(function ($timebox) use ($user, $credentials) {
+            $validated = ! is_null($user) && $this->provider->validateCredentials($user, $credentials);
 
-        if ($validated) {
-            $this->fireValidatedEvent($user);
-        }
+            if ($validated) {
+                $timebox->returnEarly();
+
+                $this->fireValidatedEvent($user);
+            }
 
-        return $validated;
+            return $validated;
+        }, 200000);
     }
 
     /**
@@ -882,6 +897,16 @@ public function getSession()
         return $this->session;
     }
 
+    /**
+     * Get the timebox instance used by the guard.
+     *
+     * @return \Illuminate\Support\Timebox
+     */
+    public function getTimebox()
+    {
+        return $this->timebox;
+    }
+
     /**
      * Return the currently cached user.
      *
diff --git a/src/Illuminate/Support/Facades/Facade.php b/src/Illuminate/Support/Facades/Facade.php
index 219e599..798457d 100755
--- a/src/Illuminate/Support/Facades/Facade.php
+++ b/src/Illuminate/Support/Facades/Facade.php
@@ -290,6 +290,7 @@ public static function defaultAliases()
             'Session' => Session::class,
             'Storage' => Storage::class,
             'Str' => Str::class,
+            'Timebox' => Timebox::class,
             'URL' => URL::class,
             'Validator' => Validator::class,
             'View' => View::class,
diff --git a/src/Illuminate/Support/Facades/Timebox.php b/src/Illuminate/Support/Facades/Timebox.php
new file mode 100755
index 0000000..3123916
--- /dev/null
+++ b/src/Illuminate/Support/Facades/Timebox.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Illuminate\Support\Facades;
+
+
+/**
+ * @method static \Illuminate\Support\Timebox make(callable $callback, int $microseconds): mixed
+ *
+ * @see \Illuminate\Support\Timebox
+ */
+class Timebox extends Facade
+{
+    /**
+     * Get the registered name of the component.
+     *
+     * @return string
+     */
+    protected static function getFacadeAccessor()
+    {
+        return \Illuminate\Support\Timebox::class;
+    }
+}
diff --git a/src/Illuminate/Support/Timebox.php b/src/Illuminate/Support/Timebox.php
new file mode 100644
index 0000000..6c7c838
--- /dev/null
+++ b/src/Illuminate/Support/Timebox.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace Illuminate\Support;
+
+class Timebox
+{
+    /**
+     * Is the timebox allowed to do an early return
+     *
+     * @var bool
+     */
+    public $earlyReturn = false;
+
+    /**
+     * @param  callable  $callback
+     * @param  int  $microseconds
+     * @return mixed
+     */
+    public function make(callable $callback, int $microseconds)
+    {
+        $start = microtime(true);
+
+        $result = $callback($this);
+
+        $remainder = $microseconds - ((microtime(true) - $start) * 1000000);
+
+        if (! $this->earlyReturn && $remainder > 0) {
+            $this->usleep($remainder);
+        }
+
+        return $result;
+    }
+
+    public function returnEarly(): self
+    {
+        $this->earlyReturn = true;
+
+        return $this;
+    }
+
+    public function dontReturnEarly(): self
+    {
+        $this->earlyReturn = false;
+
+        return $this;
+    }
+
+    /**
+     * @param  $microseconds
+     * @return void
+     */
+    protected function usleep($microseconds)
+    {
+        usleep($microseconds);
+    }
+}
diff --git a/tests/Auth/AuthGuardTest.php b/tests/Auth/AuthGuardTest.php
index f062cbc..8f30fb7 100755
--- a/tests/Auth/AuthGuardTest.php
+++ b/tests/Auth/AuthGuardTest.php
@@ -16,6 +16,7 @@
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Contracts\Session\Session;
 use Illuminate\Cookie\CookieJar;
+use Illuminate\Support\Timebox;
 use Mockery as m;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Cookie;
@@ -94,6 +95,10 @@ public function testAttemptCallsRetrieveByCredentials()
     {
         $guard = $this->getGuard();
         $guard->setDispatcher($events = m::mock(Dispatcher::class));
+        $timebox = $guard->getTimebox();
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback) use ($timebox) {
+            return $callback($timebox);
+        });
         $events->shouldReceive('dispatch')->once()->with(m::type(Attempting::class));
         $events->shouldReceive('dispatch')->once()->with(m::type(Failed::class));
         $events->shouldNotReceive('dispatch')->with(m::type(Validated::class));
@@ -103,9 +108,12 @@ public function testAttemptCallsRetrieveByCredentials()
 
     public function testAttemptReturnsUserInterface()
     {
-        [$session, $provider, $request, $cookie] = $this->getMocks();
-        $guard = $this->getMockBuilder(SessionGuard::class)->onlyMethods(['login'])->setConstructorArgs(['default', $provider, $session, $request])->getMock();
+        [$session, $provider, $request, $cookie, $timebox] = $this->getMocks();
+        $guard = $this->getMockBuilder(SessionGuard::class)->onlyMethods(['login'])->setConstructorArgs(['default', $provider, $session, $request, $timebox])->getMock();
         $guard->setDispatcher($events = m::mock(Dispatcher::class));
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback, $microseconds) use ($timebox) {
+            return $callback($timebox->shouldReceive('returnEarly')->once()->getMock());
+        });
         $events->shouldReceive('dispatch')->once()->with(m::type(Attempting::class));
         $events->shouldReceive('dispatch')->once()->with(m::type(Validated::class));
         $user = $this->createMock(Authenticatable::class);
@@ -119,6 +127,10 @@ public function testAttemptReturnsFalseIfUserNotGiven()
     {
         $mock = $this->getGuard();
         $mock->setDispatcher($events = m::mock(Dispatcher::class));
+        $timebox = $mock->getTimebox();
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback, $microseconds) use ($timebox) {
+            return $callback($timebox);
+        });
         $events->shouldReceive('dispatch')->once()->with(m::type(Attempting::class));
         $events->shouldReceive('dispatch')->once()->with(m::type(Failed::class));
         $events->shouldNotReceive('dispatch')->with(m::type(Validated::class));
@@ -128,9 +140,12 @@ public function testAttemptReturnsFalseIfUserNotGiven()
 
     public function testAttemptAndWithCallbacks()
     {
-        [$session, $provider, $request, $cookie] = $this->getMocks();
-        $mock = $this->getMockBuilder(SessionGuard::class)->onlyMethods(['getName'])->setConstructorArgs(['default', $provider, $session, $request])->getMock();
+        [$session, $provider, $request, $cookie, $timebox] = $this->getMocks();
+        $mock = $this->getMockBuilder(SessionGuard::class)->onlyMethods(['getName'])->setConstructorArgs(['default', $provider, $session, $request, $timebox])->getMock();
         $mock->setDispatcher($events = m::mock(Dispatcher::class));
+        $timebox->shouldReceive('make')->andReturnUsing(function ($callback) use ($timebox) {
+            return $callback($timebox->shouldReceive('returnEarly')->getMock());
+        });
         $user = m::mock(Authenticatable::class);
         $events->shouldReceive('dispatch')->times(3)->with(m::type(Attempting::class));
         $events->shouldReceive('dispatch')->once()->with(m::type(Login::class));
@@ -212,6 +227,10 @@ public function testFailedAttemptFiresFailedEvent()
     {
         $guard = $this->getGuard();
         $guard->setDispatcher($events = m::mock(Dispatcher::class));
+        $timebox = $guard->getTimebox();
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback, $microseconds) use ($timebox) {
+            return $callback($timebox);
+        });
         $events->shouldReceive('dispatch')->once()->with(m::type(Attempting::class));
         $events->shouldReceive('dispatch')->once()->with(m::type(Failed::class));
         $events->shouldNotReceive('dispatch')->with(m::type(Validated::class));
@@ -544,9 +563,12 @@ public function testUserUsesRememberCookieIfItExists()
 
     public function testLoginOnceSetsUser()
     {
-        [$session, $provider, $request, $cookie] = $this->getMocks();
-        $guard = m::mock(SessionGuard::class, ['default', $provider, $session])->makePartial();
+        [$session, $provider, $request, $cookie, $timebox] = $this->getMocks();
+        $guard = m::mock(SessionGuard::class, ['default', $provider, $session, $request, $timebox])->makePartial();
         $user = m::mock(Authenticatable::class);
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback) use ($timebox) {
+            return $callback($timebox->shouldReceive('returnEarly')->once()->getMock());
+        });
         $guard->getProvider()->shouldReceive('retrieveByCredentials')->once()->with(['foo'])->andReturn($user);
         $guard->getProvider()->shouldReceive('validateCredentials')->once()->with($user, ['foo'])->andReturn(true);
         $guard->shouldReceive('setUser')->once()->with($user);
@@ -555,9 +577,12 @@ public function testLoginOnceSetsUser()
 
     public function testLoginOnceFailure()
     {
-        [$session, $provider, $request, $cookie] = $this->getMocks();
-        $guard = m::mock(SessionGuard::class, ['default', $provider, $session])->makePartial();
+        [$session, $provider, $request, $cookie, $timebox] = $this->getMocks();
+        $guard = m::mock(SessionGuard::class, ['default', $provider, $session, $request, $timebox])->makePartial();
         $user = m::mock(Authenticatable::class);
+        $timebox->shouldReceive('make')->once()->andReturnUsing(function ($callback) use ($timebox) {
+            return $callback($timebox);
+        });
         $guard->getProvider()->shouldReceive('retrieveByCredentials')->once()->with(['foo'])->andReturn($user);
         $guard->getProvider()->shouldReceive('validateCredentials')->once()->with($user, ['foo'])->andReturn(false);
         $this->assertFalse($guard->once(['foo']));
@@ -565,9 +590,9 @@ public function testLoginOnceFailure()
 
     protected function getGuard()
     {
-        [$session, $provider, $request, $cookie] = $this->getMocks();
+        [$session, $provider, $request, $cookie, $timebox] = $this->getMocks();
 
-        return new SessionGuard('default', $provider, $session, $request);
+        return new SessionGuard('default', $provider, $session, $request, $timebox);
     }
 
     protected function getMocks()
@@ -577,6 +602,7 @@ protected function getMocks()
             m::mock(UserProvider::class),
             Request::create('/', 'GET'),
             m::mock(CookieJar::class),
+            m::mock(Timebox::class),
         ];
     }
 
diff --git a/tests/Support/SupportHelpersTest.php b/tests/Support/SupportHelpersTest.php
index 2f75cca..ed33181 100755
--- a/tests/Support/SupportHelpersTest.php
+++ b/tests/Support/SupportHelpersTest.php
@@ -571,7 +571,7 @@ public function something()
 
     public function testRetry()
     {
-        $startTime = microtime(true);
+        $startTime = hrtime(true);
 
         $attempts = retry(2, function ($attempts) {
             if ($attempts > 1) {
@@ -585,12 +585,12 @@ public function testRetry()
         $this->assertEquals(2, $attempts);
 
         // Make sure we waited 100ms for the first attempt
-        $this->assertEqualsWithDelta(0.1, microtime(true) - $startTime, 0.02);
+        $this->assertEqualsWithDelta(0.1, (hrtime(true) - $startTime) / 1000000000, 0.02);
     }
 
     public function testRetryWithPassingSleepCallback()
     {
-        $startTime = microtime(true);
+        $startTime = hrtime(true);
 
         $attempts = retry(3, function ($attempts) {
             if ($attempts > 2) {
@@ -608,12 +608,12 @@ public function testRetryWithPassingSleepCallback()
         $this->assertEquals(3, $attempts);
 
         // Make sure we waited 300ms for the first two attempts
-        $this->assertEqualsWithDelta(0.3, microtime(true) - $startTime, 0.02);
+        $this->assertEqualsWithDelta(0.3, (hrtime(true) - $startTime) / 1000000000, 0.02);
     }
 
     public function testRetryWithPassingWhenCallback()
     {
-        $startTime = microtime(true);
+        $startTime = hrtime(true);
 
         $attempts = retry(2, function ($attempts) {
             if ($attempts > 1) {
@@ -629,7 +629,7 @@ public function testRetryWithPassingWhenCallback()
         $this->assertEquals(2, $attempts);
 
         // Make sure we waited 100ms for the first attempt
-        $this->assertEqualsWithDelta(0.1, microtime(true) - $startTime, 0.02);
+        $this->assertEqualsWithDelta(0.1, (hrtime(true) - $startTime) / 1000000000, 0.02);
     }
 
     public function testRetryWithFailingWhenCallback()
@@ -649,7 +649,7 @@ public function testRetryWithFailingWhenCallback()
 
     public function testRetryWithBackoff()
     {
-        $startTime = microtime(true);
+        $startTime = hrtime(true);
         $attempts = retry([50, 100, 200], function ($attempts) {
             if ($attempts > 3) {
                 return $attempts;
@@ -661,7 +661,7 @@ public function testRetryWithBackoff()
         // Make sure we made four attempts
         $this->assertEquals(4, $attempts);
 
-        $this->assertEqualsWithDelta(0.05 + 0.1 + 0.2, microtime(true) - $startTime, 0.02);
+        $this->assertEqualsWithDelta(0.05 + 0.1 + 0.2, (hrtime(true) - $startTime) / 1000000000, 0.02);
     }
 
     public function testTransform()
diff --git a/tests/Support/SupportTimeboxTest.php b/tests/Support/SupportTimeboxTest.php
new file mode 100755
index 0000000..b11b46e
--- /dev/null
+++ b/tests/Support/SupportTimeboxTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Illuminate\Tests\Support;
+
+use Illuminate\Support\Timebox;
+use PHPUnit\Framework\TestCase;
+use Mockery as m;
+
+class SupportTimeboxTest extends TestCase
+{
+    public function testMakeExecutesCallback()
+    {
+        $callback = function () {
+            $this->assertTrue(true);
+        };
+
+        (new Timebox)->make($callback, 0);
+    }
+
+    public function testMakeWaitsForMicroseconds()
+    {
+        $mock = m::spy(Timebox::class)->shouldAllowMockingProtectedMethods()->makePartial();
+        $mock->shouldReceive('usleep')->once();
+
+        $mock->make(function () {}, 10000);
+
+        $mock->shouldHaveReceived('usleep')->once();
+    }
+
+    public function testMakeShouldNotSleepWhenEarlyReturnHasBeenFlagged()
+    {
+        $mock = m::spy(Timebox::class)->shouldAllowMockingProtectedMethods()->makePartial();
+        $mock->make(function ($timebox) {
+            $timebox->returnEarly();
+        }, 10000);
+
+        $mock->shouldNotHaveReceived('usleep');
+    }
+
+    public function testMakeShouldSleepWhenDontEarlyReturnHasBeenFlagged()
+    {
+        $mock = m::spy(Timebox::class)->shouldAllowMockingProtectedMethods()->makePartial();
+        $mock->shouldReceive('usleep')->once();
+
+        $mock->make(function ($timebox) {
+            $timebox->returnEarly();
+            $timebox->dontReturnEarly();
+        }, 10000);
+
+        $mock->shouldHaveReceived('usleep')->once();
+    }
+}