Years decades go, I went to a gym where you pushed a big button in the shower and it would run for precisely one minute. You could push the button to restart it immediately and have as long shower as you like, but every minute you had to consciously choose to continue your shower or not.
I now have a DS(17) who I think falls asleep under the shower in the morning, and his showers are l-e-n-g-t-h-y.
Does anyone know of a shower unit or attachment of some sort that limits how long the shower can be on for? Googling has only found me hour-glass type timers, which he will could ignore. They've existed in the past, does anyone know of something that exists now?