For me it took about 2+ yrs to get back to 80% and not working..
My version was from repeated /chronic RSIs and coupled with forward head posture/strain due to work postures & uses.

This TrP sticky thread has my past symptoms linked & updated in post #32 -
Trigger point information {TrPs} for short

I had to deal with work comp rules & delays & they tried to keep me working w/ restrictions while having PT and then going back to work.. there is very little work you can do with a "no hand use" restriction.. even daily living activities at home & driving to work becomes an issue..LOL
So finally they couldn't fit me in at work ,so was off work and had time to study all this stuff..

But I got the best results after I googled & found this group long ago, and educated on all things RSI & then TOS and therapies.. professional & self care..
*1 hr of PT 2-3 times a week does not offset 40 hr week of accumulated issues.. *

So you must do the home care stuff A LOT..
opposite postures arms /head forward? work on arms & head back not forcing it gentle stretching
Sharon Butler has a lot of RSI/TOS info on gentle stretching - Repetitive Strain Injury Self Care
do not force damaged muscles into a stretch .. not good..