public long elapsed(TimeUnit desiredUnit) {
		return desiredUnit.convert(elapsedNanos(), NANOSECONDS);
	}
Returns the current elapsed time shown on this stopwatch, expressed in the desired time unit,
with any fraction rounded down.

<p>Note that the overhead of measurement can be more than a microsecond, so it is generally not
useful to specify {@link TimeUnit#NANOSECONDS} precision here.

@since 14.0 (since 10.0 as {@code elapsedTime()})
shared/src/main/java/com/oasisfeng/perf/Stopwatch.java