Maybe an hour ,but my ler only tickled me for 20 or 30 seconds then stopped for a second then again.So really was not that intense.I hope to be tickled by a truely ruthless ler or 2 or 3 soon.Love multiple lers ; )
3 days straight! And it was fabulous! Lol, just kidding. Longest for me is about an hour and a half. Would love to try longer though in the right hands.