Display correct elapsed time with Roadrunner (#865)

* $elapsed is always in ms

* Revert "$elapsed is always in ms"

This reverts commit 795238d.

* Return elapsed as is if integer

src/Commands/StartRoadRunnerCommand.php

@@ -258,6 +258,10 @@ protected function calculateElapsedTime(string $elapsed): float
             return mb_substr($elapsed, 0, -2) * 0.001;
         }
 
+        if (filter_var($elapsed, FILTER_VALIDATE_INT) !== false) {
+            return $elapsed;
+        }
+
         return (float) $elapsed * 1000;
     }