I had a laparotomy and it took 4-5 months to be op pain free. It does vary, and while you can get to the stage of doing most activity without too much pain after a couple of months, the odd strange moment lifting, or twisting or pushing or going to the loo for a poop and suddenly a terrific ouch hits you out of the blue and you realise that you are still healing inside and you have overdone things 'again'.
It depends what work you do as to how soon you can go back, or you may want your employer to lighten your work load for a few months. If you work in an office then so long as you are pain free driving (which is 8-10 weeks approx) then see how you get on.
it wasn't the driving forward that was a problem, it was reversing, looking over my shoulder, reaching back for the seat belt by twisting - that was causing a big ouch for me.
I would give yourself 2 months then see how you feel. there has been a lot done on the inside of you and in the past with any hysterectomy by laparotomy patients were given 2months off for recovery. 1 month is far too soon, it does take time and it does get better but be kind to battered body and don't expect a miracle speedy recovery. It will object and you will hurt if you over do things too soon before you are ready.