The best advice is to stick with the PT exercises religiously and to not overdo things. Better to get back on the bike a little later than to get back on too soon, push yourself past what your shoulder can handle, and end up back in surgery with the bike parked even longer.
I've had two surgeries on my left shoulder for a completely torn labrum ligament and then a manipulation under anesthesia with a scope for a frozen shoulder. I was out for eight months and in physical therapy the entire time.
My right shoulder is next on the to-do list, but hopefully it will not be as bad since it is only a rotator cuff tear and partially torn biceps tendon. Not looking forward to it, but I am looking forward to having it fixed. I have had a long list of orthopedic surgeries and, in my experience, the shoulder surgery and rehab were the worst. It is my understanding that 6-8 weeks is the time I will be looking at off the bike with the next shoulder fix. Significantly better than the eight months I dealt with on the left shoulder fix.