Not too easy. Not too difficult.
Very few university students will be able to actually get drunk off bought drinks at a night club with any frequency, so I would highly recommend pre-drinking. If you're underage, the clubs aren't really an option, but the drinking age here is 19.
Also, don't go to the frats. They suck. They are sweaty, and contain hordes of horny guys going for about six girls, most of whom are already with someone. No one wins at the frat parties, no one. They also charge way too much for beer.
Hours per week:
Advice for students:
In the residences every floor has a "Floor Lounge" which is a large room that has a lot of couches and tables and a t.v. and a sink and a fridge and such. These tend to host some fairly impressive parties if you have a good floor.