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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On Halo 4's release me and my friends split-screened while playing with 2 other friends also having a sleepover at a different house doing the campaign on launch morning. It only took us I think around four hours, but we then proceeded to play matchmaking for 27 more hours. Unlike the much of the Flood, I had the time of my life and I just wish we had more soda. I had more fun than I ever had with Halo 3 due partly to the fact that I was no longer bad at Halo.