synchronized Timing stop() {
		_stop = _nanoClock.getAsLong();
		_nanos += _stop - _start;
		_start = Long.MIN_VALUE;
		_stop = Long.MIN_VALUE;
		return this;
	}
Stop the timer.

@return {@code this} timer, for method chaining
jenetics/src/main/java/io/jenetics/engine/Timing.java