Google's timer card added a new feature: stopwatch. You can search for [stopwatch] or search for [timer] and switch to the stopwatch tab. Click start/stop, reset or use the full screen option for an immersive experience. You can't add laps and the "stop" button should probably be renamed "pause".
To start the timer, search Google for [timer 10 minutes], [countdown 5 minutes], [set timer for 30 seconds], [start a timer for 1 hour and 45 minutes], [set a timer for half an hour], [start a timer until 13:00], [start a timer until midnight] and more.
It's worth pointing out that you can use both features simultaneously.
{ Thanks, Jonah Langlieb. }