15 hours a week? Wow.
Even when I played WoW I didn't have that much patience.
... to be honest, the game is a lot more fun at the beginning, and later on it dissatisfied me so much. I got on the WotLK beta, and the Death Knight quests are fun, but once you're done with those, you go straight into ordinary late-level-50 questing. Which is sooooo dull.