How long does the pain last for after arthroscopic shoulder surgery?

Really depends: Many different procedures can be done to the shoulder during an arthroscopic surgery. If bone spurs removed, shoulder debrided, then pain may be minimal and pass within a few days. If cuff repaired or labrum repaired, pain can persist for a couple of months. Make sure you understand exactly what is being done during your scope. Don't compare your results with someone else's.

6-12 weeks : The time it takes to recover varies considerably depending on the person and the actual procedures done during the surgery. Arthroscopic surgery can be a simple bone spur removal or an extensive repair of a massive rotator cuff tear. In generally people are pretty sore for 2-3 weeks requiring narcotic pain meds. Most are in a sling for 6 weeks and require physical therapy 2x/week for 4-6 weeks.

Depends: Too general to give specifics but depends on the procedure done(labral repair vs. Decompression for instance), your pain tolerance, early vigorous therapy, regional pain block used, etc. Etc. Best of luck!