My rule of thumb... when you can consistently play the lesson at speed without error three times in a row then move on.
That said, there are some lessons that just take forever to master. It's fine to move on but those should be added/revisited during your practice sessions with newer stuff. IMO.
Good luck, have fun.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins
