[systemtest]

I have a G-Shock 5600 watch that can alert me when my washing machine is finished. At the start of the cycle I take note of the total time it takes, I set that time on the timer of the watch and hit start. It will beep once the washing machine is finished. Been doing that for about 15 years now.

It works with all brands regardless of API.

[matthewmacleod]

Of course this doesn’t work with variable cycle times.

[waffleiron]

Then you'll just add 15-30 minutes, and it will still work ;)