Is there such a thing as a time-limiting shower?

[WhereYouLeftIt]

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?

I've got arse length hair and it still only takes me a maximum of seven minutes to have a shower including two shampoos and a condition.

www.showermanager.com/conservation-store/shower-timer-home.shtml

But it looks like .com only and in $

This Triton one has a timer www.diy.com/departments/triton-sirona-ceiling-fed-satin-chrome-digital-shower-mixer/99719_BQ.prd

B&Q also have Mira ones which have a clock display but not a timer, although they do have a remote control...

Just came upstairs- our shower is a Triton Satellites...and like I said it shuts off after 5 min...

non concussive is the type of simple valve you mean