Timer? Is there such a thing?

[KensalMama]

Hi, my DS (8) was very recently given a tablet & he's now started playing Minecraft on it. Problem is, he's addicted to it & wants to play all the time. We, of course, try to enforce a 30' limit a day, but I was wondering if there is a program/app that we can install & which will only allow a game to be played for X amount of time in 24hrs, and then disable it? Any help most welcome & happy Christmas to everyone!

When mine were young I bought them a little digital timer. It was set to 1 hour each day which they could use up as they wished. They soon got used to having to turn on the timer whenever they played. Worked quite well until they were about 12.
There are apps such as qualitytime but I don't think they disable the gadget.