I say play as long as you want but to an extent. If you have other priorities then get those out of the way first so you can play longer lol. Or, invite a friend over and play video games with him for a 12 hour streak. I say play what you want, just make sure that you smell the flowers once in a while, but if you start hissing at sunlight, you may want to take a break.

I would say it doesnt really matter as long as you get all your school work done.