Either in terms of overall play time or just in one session.
The first time I played Oblivion, I was not aware I could lose track of 32 hours.
I've lived over an actual month in Skyrim, that includes eating, sleeping, and wanking
(That's .4% of my life)
[spoiler]#Gaming[/spoiler]
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12 hours straight of Halo 3 BTB with some Generals because I got a shit ton of kills the first CTF match we played. And I have 8,000+ multiplayer matches played and a lot of hours on Forge, and I've played the Campaign at least 10 times all the way through. Yeah, I love Halo 3.