diff --git a/src/TimeKeeper.php b/src/TimeKeeper.php
index 14e02db0..872e6735 100644
--- a/src/TimeKeeper.php
+++ b/src/TimeKeeper.php
@@ -34,7 +34,10 @@ public function stop(Event\Code\Test $test, Event\Telemetry\HRTime $stoppedTime)
         $key = self::key($test);
 
         if (!\array_key_exists($key, $this->startedTimes)) {
-            return Event\Telemetry\Duration::fromSeconds(0);
+            return Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                0,
+                0
+            );
         }
 
         $startedTime = $this->startedTimes[$key];
diff --git a/test/Unit/Comparator/DurationComparatorTest.php b/test/Unit/Comparator/DurationComparatorTest.php
index eb45ada2..7ee141c2 100644
--- a/test/Unit/Comparator/DurationComparatorTest.php
+++ b/test/Unit/Comparator/DurationComparatorTest.php
@@ -29,8 +29,15 @@ final class DurationComparatorTest extends Framework\TestCase
 
     public function testReturnsMinusOneWhenOneIsLessThanTwo(): void
     {
-        $one = Event\Telemetry\Duration::fromSeconds(5);
-        $two = Event\Telemetry\Duration::fromSeconds(6);
+        $one = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            0
+        );
+
+        $two = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            1
+        );
 
         $comparator = new DurationComparator();
 
@@ -39,8 +46,15 @@ public function testReturnsMinusOneWhenOneIsLessThanTwo(): void
 
     public function testReturnsZeroWhenOneEqualsTwo(): void
     {
-        $one = Event\Telemetry\Duration::fromSeconds(5);
-        $two = Event\Telemetry\Duration::fromSeconds(5);
+        $one = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            0
+        );
+
+        $two = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            0
+        );
 
         $comparator = new DurationComparator();
 
@@ -49,8 +63,15 @@ public function testReturnsZeroWhenOneEqualsTwo(): void
 
     public function testReturnsPlusOneWhenOneIsGreaterThanTwo(): void
     {
-        $one = Event\Telemetry\Duration::fromSeconds(5);
-        $two = Event\Telemetry\Duration::fromSeconds(4);
+        $one = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            1
+        );
+
+        $two = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            5,
+            0
+        );
 
         $comparator = new DurationComparator();
 
diff --git a/test/Unit/SlowTestTest.php b/test/Unit/SlowTestTest.php
index d73ca871..eb2a7c2a 100644
--- a/test/Unit/SlowTestTest.php
+++ b/test/Unit/SlowTestTest.php
@@ -37,8 +37,14 @@ public function testFromTestDurationAndMaximumDurationReturnsSlowTest(): void
             $faker->word
         );
 
-        $duration = Event\Telemetry\Duration::fromSeconds($faker->numberBetween());
-        $maximumDuration = Event\Telemetry\Duration::fromSeconds($faker->numberBetween());
+        $duration = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            $faker->numberBetween(),
+            $faker->numberBetween(0, 999_999_999)
+        );
+        $maximumDuration = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            $faker->numberBetween(),
+            $faker->numberBetween(0, 999_999_999)
+        );
 
         $slowTest = SlowTest::fromTestDurationAndMaximumDuration(
             $test,
diff --git a/test/Unit/Subscriber/TestPassedSubscriberTest.php b/test/Unit/Subscriber/TestPassedSubscriberTest.php
index 94e91676..822f4fe5 100644
--- a/test/Unit/Subscriber/TestPassedSubscriberTest.php
+++ b/test/Unit/Subscriber/TestPassedSubscriberTest.php
@@ -38,10 +38,10 @@ public function testNotifyDoesNotCollectSlowTestWhenDurationIsLessThanMaximumDur
     {
         $faker = self::faker();
 
-        $maximumDuration = Event\Telemetry\Duration::fromSeconds($faker->numberBetween(
-            5,
-            10
-        ));
+        $maximumDuration = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            $faker->numberBetween(5, 10),
+            0
+        );
 
         $preparedTime = Event\Telemetry\HRTime::fromSecondsAndNanoseconds(
             $faker->numberBetween(),
@@ -72,9 +72,15 @@ public function testNotifyDoesNotCollectSlowTestWhenDurationIsLessThanMaximumDur
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $passedTest
@@ -104,10 +110,10 @@ public function testNotifyDoesNotCollectSlowTestWhenDurationIsEqualToMaximumDura
     {
         $faker = self::faker();
 
-        $maximumDuration = Event\Telemetry\Duration::fromSeconds($faker->numberBetween(
-            5,
-            10
-        ));
+        $maximumDuration = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            $faker->numberBetween(5, 10),
+            0
+        );
 
         $preparedTime = Event\Telemetry\HRTime::fromSecondsAndNanoseconds(
             $faker->numberBetween(),
@@ -134,9 +140,15 @@ public function testNotifyDoesNotCollectSlowTestWhenDurationIsEqualToMaximumDura
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $passedTest
@@ -166,10 +178,10 @@ public function testNotifyCollectsSlowTestWhenDurationIsGreaterThanMaximumDurati
     {
         $faker = self::faker();
 
-        $maximumDuration = Event\Telemetry\Duration::fromSeconds($faker->numberBetween(
-            5,
-            10
-        ));
+        $maximumDuration = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            $faker->numberBetween(5, 10),
+            0
+        );
 
         $preparedTime = Event\Telemetry\HRTime::fromSecondsAndNanoseconds(
             $faker->numberBetween(),
@@ -196,9 +208,15 @@ public function testNotifyCollectsSlowTestWhenDurationIsGreaterThanMaximumDurati
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $passedTest
diff --git a/test/Unit/Subscriber/TestPreparedSubscriberTest.php b/test/Unit/Subscriber/TestPreparedSubscriberTest.php
index 13f3e5db..bb76968c 100644
--- a/test/Unit/Subscriber/TestPreparedSubscriberTest.php
+++ b/test/Unit/Subscriber/TestPreparedSubscriberTest.php
@@ -54,9 +54,15 @@ public function testNotifyRecordsTestStartWithTimeKeeper(): void
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $preparedTest
diff --git a/test/Unit/Subscriber/TestSuiteFinishedSubscriberTest.php b/test/Unit/Subscriber/TestSuiteFinishedSubscriberTest.php
index cd0aff67..fac195ae 100644
--- a/test/Unit/Subscriber/TestSuiteFinishedSubscriberTest.php
+++ b/test/Unit/Subscriber/TestSuiteFinishedSubscriberTest.php
@@ -46,9 +46,15 @@ public function testNotifyDoesNothingWhenCollectorHasNotCollectedAnything(): voi
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $faker->word,
@@ -142,9 +148,15 @@ public function testNotifyDoesNothingWhenReporterHasNotReportedAnything(): void
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $faker->word,
@@ -244,9 +256,15 @@ public function testNotifyEchosReportWhenReporterHasReportedSomething(): void
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
                     Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween())
                 ),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
-                Event\Telemetry\Duration::fromSeconds($faker->numberBetween()),
+                Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+                    $faker->numberBetween(),
+                    $faker->numberBetween(0, 999_999_999)
+                ),
                 Event\Telemetry\MemoryUsage::fromBytes($faker->numberBetween()),
             ),
             $faker->word,
diff --git a/test/Unit/TimeKeeperTest.php b/test/Unit/TimeKeeperTest.php
index 1d824f40..ba8e9338 100644
--- a/test/Unit/TimeKeeperTest.php
+++ b/test/Unit/TimeKeeperTest.php
@@ -50,7 +50,12 @@ public function testStopReturnsZeroDurationWhenTestHasNotBeenStoppedButNotStarte
             $stoppedTime
         );
 
-        self::assertEquals(Event\Telemetry\Duration::fromSeconds(0), $duration);
+        $expected = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            0,
+            0
+        );
+
+        self::assertEquals($expected, $duration);
     }
 
     public function testStopReturnsDurationWhenTestHasBeenStartedAndStopped(): void
@@ -136,7 +141,12 @@ public function testStopReturnsZeroDurationWhenTestHasBeenStartedAndStoppedAndSt
             $secondStoppedTime
         );
 
-        self::assertEquals(Event\Telemetry\Duration::fromSeconds(0), $duration);
+        $expected = Event\Telemetry\Duration::fromSecondsAndNanoseconds(
+            0,
+            0
+        );
+
+        self::assertEquals($expected, $duration);
     }
 
     public function testCanStartAndStopMultipleTests(): void