I basically game as much as I want, about 1.5 times per week. However, some people I game with do not know how to schedule their time like adults. Regular days are set aside or days are booked far in advance but they seem unable to cope with the idea that anything can be confirmed more than about 7 days in advance. Some of these players are, weirdly, quite committed to the games, carefully writing down everything that happens, doing outside reading, etc. and yet they're plugged into social networks that makes decisions about scheduling other events on the fly.
It has caused me to start to discriminate against players who are younger or, and this is the height of hypcrisy, enrolled in school. I'm doing my PhD and therefore doing school full-time but I find that most people in my program, even people older than me, run their social lives like they're still 25. So I choose to game with professionals in their 30s and 40s.