I made a post a few months ago of a ridiculous session I had at Rush Poker where I made 56 buy-ins, before they released $2/$4. I was able to top that today in only 10 hours, making just over 60 buy-ins for $14,500. It was done at Rush Poker by playing 4 x 200NL 6-max, 4 x 200NL 9-max and 4 x 400NL 9-max.
This should be an unofficial record for Rush, someone might have had a bigger session at regular ring games, though. I know Chiren had a couple of 50 buy-in sessions at 2NL last month, but I don't think penny stakes really count anyways. I would have liked to keep the session going but unfortunately I'm moving today and had to log off.
There's been a few delays in planning the prop bet for 60k hands in 24 hours with profit, hopefully it will happen soon.