Hi Roger,
That is such a tough question. People heal (not from the TOS) but just from surgery at different rates. Pain control and swelling will be issues as well as how they go in to take out the extra rib.
I went back to work within a week only because I had to but really only sat there each day until I could go home and rest. I rested in my office per se. But I was so not ready to be back.
I would say give yourself a couple of weeks and make sure you have a good PT that understands TOS. Bad PTs can screw up a good surgery.
Good luck and
P.S. Are you in So Cal? If so PM me I have a good PT.