My longest session topped out at 9 hours. That included short breaks for potty usage and rehydrating. That was about 7 years ago though, when I was not getting my fill of tickling and I was completely insaitable. Now that it's part of my daily life, combined with the fact Lazarus could break me in 5 minutes flat if he really wanted to, due to his knowledge of my body and bad spots, I would probably only top out at about 90 minutes.
Damn loss of stamina...
Mimi
Damn loss of stamina...

Mimi