I consider 5-6 hours just a good play session, not a binge. That said, I get time to do that only a few times a year.

Longest I have ever played a game straight is when a friend dared me to beat FF7 in one shot, with no eating or sleeping. Final time was 21:42. I probably could have shaved a couple hours off, but I was (relatively) taking my time and enjoying myself because I hadn't played the game in quite a while.

In terms of over a week, I am sure there exists weeks where I have played for 12 hours a day, every day. Ah, back in the day....