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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Straight might be 20 hours. Oh how I loath WoW now that I think about it. My parents were away and did not have any classes that day. I hate raids. Ovee all maybe 3-5000 hours spread over 20 years of when I started playing at 4 years old.