Sometimes you might need a stopwatch. No reason these days to install one on your PC. Just use https://big-clock.com/

If you need a timer, you could try this: https://www.online-stopwatch.com/countdown-timer/

Paul LI’s free timer to download and install, it has the advantage that it remembers some settings:
https://sourceforge.net/projects/countdowntimer/
When you press its minimize button it minimizes to tray, not to taskbar. That would be a bit confusing at first, because you wouldn’t konw it if I had’nt written it. Or download it here.