How long does it take to recover from an arthroscopic knee surgery?

It Depends. On how active you are and how much was done during surgery. For a routine knee scope i typically allow my patients back to work in 3-4 days if they have a sedentary job. Otherwise, most people can start getting back to work at 2-3 weeks depending on their job. Strengthening of the quadriceps muscle is key as this shuts down with knee surgery of any kind. Most people are near full by 4 weeks.
Variable. Recovery varies from patient to patient. Average recovery is 3weeks. Physical therapy can help speed your post-operative recovery.