When I adopted my gal she had several layers of retained scutes. I've had her since maybe June of July and still waiting for her to shed. I have the cuttlebone, a variety of proper vegi's that I've read on here depending on what is on sale

uvb, minus the tank size and the fact I think I'm now ok with the fact that she eats the dock, I think I'm a pretty good turtle owner...
cuz I know those questions may be asked

So... how long does it take to shed, and when she does shed, will those retained scutes come off as well?