I admit I usually hop right onto Stonemaul nowadays, but I'd be willing to stop by Cenarius to check in first when I sit down to play.
I usually play after I get home from class, when I don't have an assignment or paper due the next day, usually between 2 p.m. and 5 p.m. Mondays and Wednesdays. Friday mornings and early afternoons are probably my best times to play, since my wife has classes on Fridays and I don't. I usually try to stay off WoW on Saturdays, unless my wife is busy with schoolwork and I don't have any assignments due the following Monday.