@kveldulf: well man i have a friend that has played 16,459hrs on one single fricken game not joking lol.

Here's mine!
Counter Strike Source - 648 hours

Garrys Mod - 603 hours

Counter-Strike - 460 hours

Counter-Strike: Global Offensive - 303 hours

Zombie Panic: Source - 110 hours

Insurgency - 82 hours

Counter-Strike: Condition Zero - 47 hours

No More Room in Hell - 42 hours

Left 4 Dead 2 - 35.1 hours

Killing Floor - 35 hours
What are yours???!