Right now around 20-25 hours a week while maintaing a part time job, full time college student, and somewhat of a social life. I'm not making excuses, I'm fine with how I manage my time. Can't wait to quit the part time job though, I'd love to be able to work more on online stuff. But when you aren't making any serious dough, you kinda need that part time job...
I'm kinda in the same dilemma: college full-time, part-time job, g/f. It's really hard to leave the part-time job, not only because I've been working there so long but I need the money as well. I'd say I probably "work" (counting college + job) anywhere from 40-50 hours per week.