code: public static ScheduledFuture<?> schedule(Runnable runnable, Duration runFrequency, TimerType timerType)
  	{
  		switch (timerType)
  		{
  		case OneTimeRun:
  			return executor.schedule(runnable, runFrequency.toMillis(), TimeUnit.MILLISECONDS);
  
  		case RepeatRun:
  			return executor.scheduleWithFixedDelay(runnable, runFrequency.toMillis(), runFrequency.toMillis(), TimeUnit.MILLISECONDS);
  
  		default:
  			throw new UnsupportedOperationException("Unsupported timer pattern.");
  		}
  	}
docs: runFrequency implemented only for TimeUnit granularity - Seconds