Is there a regulation that covers heal time and recovery after surgery for soldiers with very little time left on their contract?

You're close to your ETS date, just walk in and extend. You don't need to have a reason as long as you're retention eligible - ie not flagged, barred, etc

Not an answer to your question but advice nonetheless. Take care of your knees because you will really feel it in your later years. I like the advice given by CW3 Kevin Storm. I myself benefited from a commander who never gave up on me because of injuries. I kept him in the loop of my recovery. I also had a very good doctor who believed in my recovery and return to duty. Good Luck with your recovery Specialist!

Nature of the surgery if it matters is my first surgery was for meniscus and acl repair, torn from being airborne and having a few bad landings. ACL was repaired using a portion of my patella tendon. Second surgery was for a complete patella tendon tear and was repaired using my hamstring tendon. Nature of the surgery explained by the orthopedic doctor, it was a last ditch effort to fix it and if I tear my tendon again, there’s no fixing it. Expected heal time is between 6 to 12 months and going off my last surgery it’s going to be closer to 12 months. Also from my first surgery, the pin used for the new tendon backed out of the bone is floating in my knee. Not a pressing concern compared to my patella tendon but I may need another ACL repair surgery