I had lapcrscopic bypass a few weeks ago ... went back to work 5 days later (Op on a Wed - returned work on Monday, having taken 3 days as holiday). For me it was a bit like this .... day 1-3 felt grim, day 4 felt miles better, day 5 felt pretty normal.
I work in an office, commute by train, with some long haul international travel on a monthly basis. First week I felt a bit pooped by end of day and that's with me sitting on my bum most of the time, so if you need to stand all day I suspect you'd need more breaks or to wait longer. If I did it again, I'd probably have taken a week off.
It just goes how variable the experience can be. I think I might have been pretty lucky.
Hope it goes well for you!
Hugs
yoyo