I had a fracture/ dislocation to mine. surgery will be 4-6 weeks recovery as a minimum, within three weeks you should feel well enough to start getting it out of the sling.
Getting back on the bike wise, I’ll be honest, I haven’t really ridden a mountain bike since the initial injury. Partly due to a change in circumstances (all my mtb friends are super rad DH manimals, I’m more of a singletrack hunting map reading all day adventure type!), partly due to the fear and also as my shoulder couldn’t take the knocks anymore.
I can ride a road bike, something to do with the rotation i suspect?
Anyway, the main thing is the physio, its a drag, and you get bored, but do it loads, once you’ve finished your NHS physio (Or private if you’re that way inclined) get a physio who knows about cycling as you’ll find that an arm injury will also impact your back, and conversely pelvis/ legs etc.
once I could get my arm out of the sling i spent 2-3 hours a day on the turbo, this is quite good for the shoulder as it meant I could lean into the bars but ease the pressure/ stop if I needed to. I’d recommend WW2 in colour on netflix or long documentaries for this!
Also nappy cream in your armpit and where your arm meets your chest if you’re going to be in a sling for a while!