Hi,
I have just about fully recovered from AC in my non-dominant shoulder. I fell in December '99 and did not start PT till March. I had lost a great deal of ROM, though I don't remember the measurements. I went to PT 3 times a week for a little more than 4 months. I have complete functional range of motion, except reaching behind my back, which is still a bit of an effort. I think it is really important to keep doing the things that are hard but possible, reaching shelves, etc. Good luck in your recovery.