If it is a dislocated shoulder, it can be pretty minor if it went in and out again or can be far far more serious. When I did mine for the first time I was out of action for 2-3 months, subsequent times I could have played again after 2-3 weeks.
Instinct based on how he reacted...it isn't a terrible one. But, we'll see...fingers crossed.
brother in law played football to a good standard in Dublin, he had it happen him loads, eventually used to click it back in place himself, it used to even happen on holidays, got to the stage where it was regular and it wouldnt even bother him, just moved his arms about and he was fine. no time off
With some people though its bad, im sure weve all seen people click it back in and they scream the place down.
I think it happened Dudek just after we won the champions league, he was out about 3 months