Edvard stated: source post
Primey, it took about 10 weeks for me in total to recover, immobilization included. But I had a dislocated shoulder, which means the humerus was out of the shoulder joint cavity. I had it repositioned and waited for the structures to heal, then recovered full mobility. What I see from the image you posted, you have a separated shoulder which is sorta different. The ligaments between the collarbone and shoulderblade are fucked, but the mobile joint of the shoulder is not affected, which is very good. Still, the surgery sounds like a massive pain in the ass. Then you'll have at least another one to remove the implant thingy. Hope you get past it well.
in '97 I suffered a similar injury and took the same approach. I have full range, with discomfort, but full range all the same. If I sleep on it wrong it can be a bother the next day, however it has been 20 years and I am not a 20-something anymore... wouldn't get cut, Prime, unless it is the only option.