I use chicken thighs only Sage. I do them for 10 hours on low but I take the bones out.
I did try the 24 hour method one time but the bones were still too hard for my liking. That was in a brand new crockpot. Good luck!
Edit to correct after I read vj's post. Yes, I do mine on low as well, but only for 10 hours and remove the bones.