Both instances of my PMR lasted about the same amount of time, approximately six months. The rheumatologist advised a three month taper, depending on my symptoms. Fortunately the symptoms continued to subside even though I was decreasing the prednisone. Although I still have some residual pain in my shoulders and hips, it is not too bothersome and easily managed with a single dose of ibuprofen or Tylenol. I feel very lucky, but am worried about a recurrence with further vaccine shots or actually contracting the virus. The rheumatologist advised that people with autoimmune disorders like PMR tend to experience more severe cases of the virus. I wish you well in your journey.