I've done sessions from 10 am - 4 am on a few games including toilet, cigarette and snack breaks. The two most recent games i did that for would be lost odyssey and fire emblem radiant dawn, I also played through bioshock on hard collecting all the plasmids and audio diaries in one day which probably took around 14-16 hours total and played through viking battle of asgard on hard the next day which took around 12 hours then played through rise of the argonauts on hard the day after which was probably about 14 hours. I was ill off work if anyone was wondering, lol.

8 hours think it was Need for Speed Carbon, finished it!!

Recently I take breaks about every hour or two.

In the past Oh, Before me and my bother had our own SNES. We had rented one with Super Mario Word from the video store during spring break. We played it from the time we woke up unitll we passed out. For seven days straight.

17 hours on FF XII...

Probably back when FFVIII was released. I went through the whole of the 1st disc (about 12 hrs) + a little extra of the 2nd. I had my food brought up to me as I was living with my parents, and my mum felt I had to eat, lol.

Don't think I can do that anymore as I don't think my girlfriend would be too happy, lol. Although I probably have played Oblivion for a similar amount of time whilst I've been living with her.

The WoW guys are a different breed entirely, I just couldn't play for more then 14 hrs straight.

final fantasy X for about 6 hours

I used to do 10-12 hours regularly when i was on school holidays. No time for that these days though.

5 Hours playing the Witcher, i cant do longer stints i get just get too tired. But after an hour break or so i can resume playing. But the longest i ever stayed up playing was around 4, again i need my sleep more then anything.

a few years ago i played baldur's gate:dark alliance from when i woke up at 7 til about 5 the next morning. i stopped for about 15 minutes to grab food. thankfully, my bedroom was right next to the bathroom for pee breaks >.
more recently, i tend to play twilight princess for 6-8 hours at a time, if i dont have any place i need to be

I played 6 hours Mario Kart Wii with 3 friends. That was an awesome day!