Simple just go to your steam profile and look it up:

Playing time:
21.5 hrs past 2 weeks

and growing since the vacations have started.

31.3 hours.
Mostly the Christmas achievements and Humble Bundle games. And Portal 2, which I got from a friend who got it from the achievement gift pile.

11.6 only :o
More of a console nerd.

30 hours is not even much, ive had maximum like 90.

30.3 hrs past 2 weeks

18 hours a day online at Kovloria (Tibia private server) when there was double-exp event. For a week, when I had break without job. Beat the shit out of highscores, I think nobody still beat that online time

It is possible, i had it when i had summer vacation

And one guy off my friend list has

Playing time:
172.5 hrs past 2 weeks