We don't have many lectures with compulsory attendance or the like. For most of them it's enough to get yourself some scripts and study at home.
You could...but I prefer to study alone anyway. Much more time-efficient. And we don't have compulsory groupworks which usually definitely are the biggest waste of time.
The rest doesn't take much more than 1-2 hours per day, and playing games basically is my only hobby, which I commit pretty much all of my spare time to.
Of course, there are days on which I can't play that much or not much at all...but on average, especially taking the semester breaks into account...yeah.