On a slight tangent, but worth knowing perhaps: I have just been told by my Ophthalmologist that I should place a hot towel on my eyes for 3 minutes after which, pull forward my lower eyelids & use a cotton bud to wipe their edges.
Problem: how do know when 3 minutes have lapsed with a hot wet towel on your eyes?
Answer: I have just found this useful online stopwatch website, which can be set for any duration & a buzzer will tell you when the time has lapsed (make sure your sound is on).
https://timer.onlinealarmkur.com/en/
Could be useful for many other things from timing an egg to taking a nap - the alarm can be set to either a buzzer or a rooster!