I haven't had GCA but have had 2 occurrences of PMR. First time took 3 and half years to get off of prednisone and I was in remission for 6 years before the PMR came back. The second time I was able to taper off in 1 and half years which I think was more about making additional lifestyle changes that I didn't do my first time around with PMR. I've been in remission from the second time around since the fall of 2018 so guess I'm pushing a little over 4 years now being off of prednisone. I guess time will tell 🙂