Sorry to hear you have to go through this.

The surgery will be under general anaesthestic, so no, you will not be able to drive for 24 hours following it. You would need at least a few days off of work (if you work) - perhaps even a week - because laparotomy is bigger surgery than a laparoscopy - you will have a bigger incision on your belly, and therefore most likely more stitches etc.

The surgery make take a few hours as well - ask the nurse who booked you in for it how long they think it might take. It sounds like a lot of endo to remove, and therefore it can take a longer time than normal.

You always need to stay at the hospital for 4 hours following surgery under general anaesthestic as well, so you could be at the hospital for a whole day - perhaps late into the night, if you are booked to go into theatre in the afternoon.

(I haven't had one of these myself, but I have had a laparoscopy).

You will need a follow-up appointment a few days after the surgery as well - to get the stitches out.

Hope this helps - when is the surgery?