Longest single session of playing one game?

[FarleyMcFirefly]

Bathroom and meal breaks are permitted :P

How long was your longest session of playing a single game?

I think I've done close to 10 hours a few times each with Hyrule Warriors, Arkham City, Wind Waker HD, and Assassin's Creed III.

I've come close to that with a few games... Now I feel depressed and should go outside... Maybe tomorrow.