Steam says 472 hours for TF2 and 400 for L4D2. Steam didn't start counting the time until quite a while after I bought TF2, so it's definitely much more than that. The other figure seems accurate enough, with the amount of time I've spent loading and in the lobby ¬.¬
120 or so hours on the first play through FFX. So. Much. Blitzball! Had to get Wakka's Celestial Weapon though, couldn't be helped.
Pretty sure I've spent hundreds and hundreds of hours in Super Smash Bros Melee and Sonic Adventure 2: Battle.
Played Ocarina of Time, Majora's Mask, Wind Waker and Twilight Princess all countless times, so I'm betting that adds up to something significant. Played the original Legend of Zelda and A Link to the Past, but I've only completed the former once and the latter just over halfway.
I wish there was some kinda record of how many hours I've spent on games in total over the course of my whole life - that would be interesting to see
If I'd used that time for other pursuits, I'd probably have mastered several different languages and musical instruments by now!
But "wasting" that time on video games was worth it 
Edit: Oh, also spent a bunch of time in Zombie Panic! Source.
120 or so hours on the first play through FFX. So. Much. Blitzball! Had to get Wakka's Celestial Weapon though, couldn't be helped.
Pretty sure I've spent hundreds and hundreds of hours in Super Smash Bros Melee and Sonic Adventure 2: Battle.
Played Ocarina of Time, Majora's Mask, Wind Waker and Twilight Princess all countless times, so I'm betting that adds up to something significant. Played the original Legend of Zelda and A Link to the Past, but I've only completed the former once and the latter just over halfway.
I wish there was some kinda record of how many hours I've spent on games in total over the course of my whole life - that would be interesting to see
Edit: Oh, also spent a bunch of time in Zombie Panic! Source.