I would think at least 3-6 mos, if not longer - for
injured nerves (trapped) to heal. Sometimes it can take
3 or 4 years to recover at least 75%-85% of prior state.
Injured nerves are very slow to regenerate.
When they do, it is possible that new pathways are grown, to bypass any that may not heal properly.
Expecting 100% recovery may be setting the bar a bit high.
Check about supplements to help improve
the healing process (esp B12).