Mine was more of a RSI type of TOS, hands stopped working a few times early on, pain level at worst was about a 6-7 at times. Interfered with sleep during the worst of the spasms.

Took approx 2.5 yrs of various PTs & sessions, expert chiro, and lots of gadgets & self care.
Part of that time was wasted due to work comp and mis dx of RSI/shoulder strains only
They also had me work modified jobs for awhile early on but it was still repetitious tasks , so no improvement was gained , just less damage being done.
I'd guess roughly a year was wasted, so if a person is lucky & has a good team of care providers maybe 1.5 yrs to turn it around..
depending on how bad your are at the starting point.