My school belive it or not as snack time, 15 minutes (and its high school) and a one hour lunch. around that time period is pretty much when i get a chance.
Unfortunetly a classmate of mine is bugging me about playing it on my laptop, my worlds, my saves.
it can become annoying. I dont know if he has it or not (legally speaking) but i do tend to find a break somewhere or sometime. usually eithere by finishing the work early or that a teacher calls it sick.
they just bring somebody to warm the desk's chair.