Hi and welcome to the Chiari forum.
As CW mentioned, it is a very individual thing...many have related conditions that factor into the healing process....I am not sure exactly how long my recovery from the surgery was, but I know I discovered new benefits each year out...next May I will be 10 years post op.
And what you do, as CW indicated can cause healing to be prolonged or for set backs to occur.
All I can suggest is that you listen to your body, and let it decide how long it will take and do not rush things, I have the tortoise as my avitar because slow and steady wins the ran...same goes for recovery.
Recovery is really an individual thing. Meaning it will be different for everyone depending on your health, surgery etc. However, I was told 6-8 weeks. Mine took longer because I was bullheaded and pushed more than was wise. That said it was a good 12 weeks but again I pushed it and that slowed healing.
CW