src/main/java/org/eiichiro/reverb/time/Stopwatch.java
public long stop() {
		if (isRunning()) {
			stop = System.nanoTime();
			total += stop - start;
			running = false;
		}
		
		return Math.round(total * getPrecision().value);
	}
public long stop() {
		if (isRunning()) {
			stop = System.nanoTime();
			total += stop - start;
			running = false;
		}
		
		return Math.round(total * getPrecision().value);
	}
Stops to measure.

@return Elapsed time.