I have no experience with ankles but I know that knees take a long time, ask your physical therapist or call the OS, I'm sure he has done more than one of these and would be able to answer your question.
My graft was taken from my knee and put into my knee, NWB into WB so it would make sense for him to take it from ankle and into ankle. Good luck and I hope you are up and around soon. Have you had an MRI recently. Might be worth a look inside to see how things are looking?...
Shelby
14 months post OATS Right Knee