What game have you rack up the most hours playing?

[wfz]

Over 8,500 hours in Runescape when I was younger...

More recently, I have Dota 2 and Battlefield 3.

Origin says I've played 60 hours of BF3, but that doesn't feel right. It feels like I've spent over 200 hours easily.. O.o

324 hours played in Dota 2.