When I was in high school, I'd play during boring classes. Usually a good mix of gaming/browsing the web.
Also anytime I had to wait for something to be done, I'd just whip out my phone and play a quick "session."(i.e. Waiting in the lunch line or something similar)
Now that I'm off to college though I guess Ill have more free time, but I'll probably do other things. Still nice to have them on my phone though.