It took me ~half the year to get back onto the tennis court, but there's more to it than that.
I think it's normal, you probably know my story by now through our communications over the time of your recovery, but I'll refresh you: two shoulder surgeries for SAD and rotator cuff work all before the age of 23 (or 22 I don't remember).
It wasn't until 2 years after the 2nd surgery that, the shoulder was well enough to serve on consecutive days without it screaming at me.
Just keep doing your exercises and stretches. Also, I think it's important that you KEEP serving. You're sore because you lack the stamina to serve repeatedly. Unfortunately, no amount of rehab can mimic the motion of the serve (at least safely!).
So keep serving, get a basket of balls. If you think you'll be sore after 100 balls, then serve 80-90. As your shoulder gets tired, the rotator cuff loses its strength and ability to stabilize the joint. You just have to work at it.
Last edited by Say Chi Sin Lo; 12-03-2012 at 12:29 PM.