Sorry, I know longer keep track, but I would guess, based on when I did try to keep track, that it was around 20 - 25 hours. Hard to keep track, I start one, keep it on the saw and will scroll every chance I get. Sometime I sit there for several hours, sometimes a few minutes. I made a log to fill out sometime ago but found out I'd rather scroll than filling in a logsheet..... It got forgotten pretty quickly.