Anyone know how I can limit total ipad time and not just time on individual apps?

[nowwearefour]

I have worked out an iPad can limit time on individual apps but I want to be able to say to dds in the hols they can have a total of eg 1 hr for the whole day and then it won't permit them to spend any more time on devices. Ah thoughts on how I need to do this. Do I have to buy an app ? And if so, does anyone have any recommendations? I would rather just do it from settings if ican...?

Don't fully charge it

Take it away when the hour is up.

Regina it isn't as easy as that if the hour is spread over the day. Of course I can do that. It is what I am doing now. I just want a more sophisticated solution. It must exist.

on guided access you can set a time limit which locks everything down after the set time and can only be reset with the pin. you wouldn't be able to set an hour over the day though. although you could do 15mins and they know they can only bring it you for the pin 4 times?