Garrysmod, with 629 hours.
Unofficially, you could say Fallout 3 comes in a close second, but I don't know exactly how much of that I've played due to me using the FOSE .exe. But I know it's got to be 500+, definitely.
Portal - 1337.5 hours
Portal 2 - 821 hours
TF2
459 hours
Garry's Mod
813 hours played.
Revelations 2012 for 527.2 Hours
[QUOTE=BananaFoam;36893550]Revelations 2012 for 527.2 Hours[/QUOTE]
Why would you do this, why, WHY!
[QUOTE=soullink;36894178]Why would you do this, why, WHY![/QUOTE]
I am a masochist.
Garry'smod, followed by TF2.
TF2 around 800 hours
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