$date_archived = $completed_task->getArchivedEpoch();
      $queue_seconds = $date_archived - $completed_task->getDateCreated();

      // The task may have completed in the same epoch second it was created.
      if ((int)$queue_seconds > 0)
        $sec_in_us = phutil_units('1 second in microseconds');
        $queue_us = $queue_seconds * $sec_in_us;
        $queue_exclusive_us = $queue_us - $duration;
        $queue_exclusive_seconds = $queue_exclusive_us / $sec_in_us;
        $rounded = floor($queue_exclusive_seconds);
        $completed_info[$class]['queueTime'] += $queue_exclusive_seconds;

        phlog("got {$queue_seconds}s, {$queue_exclusive_seconds}us, res={$rounded} id={$completed_task->getID()}");
      }