Hmm, I'll just post what I said in the VP thread, since it's more relevant here...
I am 23 and work Mon through Thu, 10 hours a day, and take Masters courses on Fri. After I finish my masters (which will be in the summer, hopefully), I will switch back to a 9 hour day Mon through Thu, with a 4 hour day on Fri. So I usually play games on Sat or Sunday afternoon before hanging out, or on portables during lunch. Soon I'll be playing Fri afternoon too, since there's not really anything going on then

I am currently single so that means I currently have a lot of free time
I will have to agree with Jack, although 30 hours is my personal sweet spot. Too many games pad themselves out with meaningless subquests, fetch quests, long cinemas with lots of contrived dialogue (I don't mind shallow characters if the story moves pretty quick, but I hate when games spend lots of time attempting to characterize characters by increasing the amount of useless banter... Arc the Lad 3, here's looking at you!) and slow plot exposition. This seems to be more of a problem in the 32 bit era, lately I've been preferring to play older RPGs... not too much in the way of long cinemas, you can get in and out of battle quick, dungeons which are long but don't take hours to trek through, and a sense of accomplishment that you're moving through the game.
FF4 I finished on GBA in 12 hours (granted I knew that game like the back of my hand)... and yet it seems so much goes on in just that 12 hours - there's such rapid pacing... unlike a game like Baten Kaitos, where it takes about 30 hours to start to get to the interesting stuff.
Then again, there are some games, where it seems the time just flies by while playing. DQ8, I can't believe I've been playing for over 40 hours, for instance. Xenosaga, on the other hand, only took me 35 hours to beat, yet the game was so slow paced and painful it feels like it took over 100.