CB ... I had rotator cuff surgery in June 2012 for a large calcium deposit termed "calcific tendonitis". In addition to removing the calcium deposit, the surgeon also took out the bursa sac and put a couple anchors in place. I was in sling for 2 months, then did numerous weeks of PT. I'm in good health, but my range of motion was not fully restored for nearly a year. Discomfort lasted for several months at various levels. The biggest post-surgery problem was trying to sleep in the upright position ... not happening. I also was surprised by the level of pain I was experiencing before and immediately after. It was not pleasant.
The greatest advice I can offer is this: After surgery, your arm will be in a sling probably with a pad between your elbow/forearm and waist. The doc will tell you to keep your arm completely immobilized, but the angle with the pad can cause excruciating discomfort in your elbow. Simply loosen the sling several times a days and let your arm hang, extending from the elbow down, without putting any pressure on your shoulder. This simple stretch will prevent the nerve in your elbow from becoming inflamed.
Interestingly, my doc instructed me to wear the sling for 8 weeks, which I did and suffered an alarming atrophying of the muscles in my bicep, tricep, and shoulder blade. Several months after my PT, I visited a chiropractor for a different issue, and he told me that he starts PT for shoulder 'scopes a week or two after surgery. I'm not sure I could have done it so soon, but just something to inquire about.
Good luck and fast healing.