I’ve recently started using a timer to measure my progress with a recurring 15-minute task and it legit skips 5 minutes every now and then, when I’m not looking.

Another weird thing is with a different recurring task which I’ve measured. I use the stopwatch for the first part and a countdown timer for the second part. It takes in total an hour according to the measurement, but the wall clock says it takes three hours.

Obviously it’s my perception of time that is messed up. But somehow it affects my use of stopwatches and timers as well. I don’t get it.