The longest I've played a game consecutively is about 5 hours. I'm sorry but I gotta say anyone that has played for over 10 hours is sad IMO. There are 3 reasons why I wouldn't or couldn't play a game for over 10 hours.
1. It gets boring.
2. I need some social interaction and the swearing I hear on the PS3 when someone dies on COD doesn't count.
3. I'd feel sick.