code: private Long computeDurationMillis(Long started)
  	{
  		Long duration = 0L;
  
  		if (started != null && started.longValue() > 0)
  		{
  			duration = Math.max(0L, (System.nanoTime() - started) / 1000000);
  		}
  
  		return duration;
  	}
docs: SECTION: UTILITY - PRIVATE