void Main()
{
	var startTime = DateTime.Now;
	var timer = new System.Timers.Timer(500);
	timer.AutoReset = false;
	timer.Elapsed += new ElapsedEventHandler((sender, e) => {
		var totalTime = DateTime.Now - startTime;
		totalTime.Dump();
	});
	timer.Start();
	SpinWait.SpinUntil(() => (DateTime.Now - startTime).TotalMilliseconds >= 250);
	var elapsed = (DateTime.Now - startTime);
	("elapsed: " + elapsed).Dump();
	timer.Stop();
	timer.Start();
}