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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My parents went out of town for the night, so I played Halo 3, quite literally, from 9 P.M. to 11 A.M. Also I've played Soul Caliber V with a friend for a good 9 hours straight. The wonders Pibb Xtra can work... As for overall, both Oblivion and Skyrim have stolen at least 700+ hours each of my life. And I don't regret a thing.