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.

About 16 hrs. and I've done it several times. 10 a.m. to 2 a.m.

Most recently with Bloodborne.

I think I played about 18 hours of Black Ops straight with my friends when I was in high school.

Is this for just one game, or a session of multiple games?

I think I played FFXIV for up to 9 hours strait once (Some food and bathroom breaks during that, though)

As for a session with multiple games, I'm sure I've done over 12 hours at some point.

14 hours of Cod mw2

It was within one day with probably more than just bathroom breaks, but I logged 12 hours on Twilight Princess once. A few years ago wife played Paper Mario: Sticker Star for 24 hours of a 48-hour period.

Skyrim owned my soul at one point. I remember playing for close to 18 hours straight. Minus bathroom breaks and food.

5 or 6 hours to Pokémon Gold. When I was 7 years old and discovered that I arrived to Kanto, the area from Red and Blue I got so damn excited that I played till midnight. Then my mother sent me to sleep by giving me a slap. Yeah, good times...

44 hours.

My Kingdom Hearts love gets a little unhealthy when a new game releases.

A few years ago I was fighting depression. One school break I was left home alone for various reasons out of my control and I ended up playing COD4 12 hours a day every day that week. Haven't topped that yet and probably never will