Exercise after 3 weeks

I have my surgery in 13 days (MMO with BA and TT with ab repair). I exercise regularly (Orange theory) and asked at my pre-op about how long to take off after surgery. My surgeon said 3 weeks and wrote a note for this for my gym membership pause. 3 weeks doesn't seem like a long enough time to recover but I am not expert. No specific direction was given for ab exercise either.

Does this seem right? How long are your surgeons saying before resuming exercise?