fix impl

Author: mvorisek

src/Reporter/DefaultReporter.php

@@ -98,7 +98,7 @@ private function lines(SlowTestList $slowTestList): \Generator
         $number = 1;
 
         foreach ($slowTestListThatWillBeReported->toArray() as $slowTest) {
-            $formattedMaximumDuration = $this->durationFormatter->format($slowTest->duration());
+            $formattedMaximumDuration = $this->durationFormatter->format($slowTest->maximumDuration()->toDuration());
 
             if ($formattedMaximumDuration === $formattedMaximumGlobalDuration) {
                 $template = \sprintf(