Team Fortress 2: 1045 hours
Counter Strike Global Offensive: 999.9 hours (I like how close I am to 1000)
Counter Strike Source: 188 hours
Kerbal Space Program: 131 hours
TrackMania United: 88 hours
I'd wager I have about 200 hours in the now-defunct SilkRoad Online. Probably close to 500 or so in World of Warcraft. Probably close to that in the original Halo's PC online multiplayer too.
Ya lightweights.
Edit: I've got a lot of other high ones I can think of especially on Wii U and PS3 but they're still nothing compared to those really. I rarely spend more than 50 hours in a game.



