Personal Stats fail... -
Drunken F00l - Jan 14, 2008
No, you can start TF2, leave it open all week and get 168hrs play time. I'm not 100% sure, but you can try it as an experiement and report back

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Personal Stats fail... -
boelter - Jan 16, 2008
You'll also notice that Steam will report a friend/other user as "In-game" while they have TF2 open whether they're connected to a server or not.