Steam According to Steam, which game have you spent the most time playing?

I think on steam it is left 4 dead 2 for me, though I have a lot of games from gamefly which im sure I've put in a lot more time, though unrelated but pretty sure I've got thousands of hours onmy ps3 games like battlefield bad company 2, uncharted, red dead etc unfortunately don't display the hours played like steam does

 

I got that beat, 315 hours on defence grid. However my biggy:

Civilisation IV: Beyond The Sword. 1608.6 hours. That's 67 days played.

Re-edit: World of Warcraft (bearing in mind I have deleted some characters) but I'm showing 232 days played in total.

 

Eve time logged in (according to the api):

Approx 150 days!

Though thankfully some of that is afk and is nothing compared to other peoples XD.
Also 7400 battles in WoTs...

Oh dear


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Dirt 3 and crysis have racked up a good few hours on steam for me, only because I mainly use them for benchmarking New components or overclocks, still haven't even played alien vs predator bought it ages ago after half completing it at a mate's house. Should really stick that on to download lol