I had awful pain with mine, when they rang to confirm I had gallstones (on my birthday!) and tell me about warning signs (darker wee, lighter poo) I was already getting them and a few days later I ended up in hospital after I got acute cholecystitis with it. So keep an eye on things if it is gallstones.
I was quite poorly by the time they took mine out - was pretty desperate to get the damn thing out by then. It was day surgery, done laproscopically and I had two weeks off work to recover afterwards from memory. If it's an open surgery job then that is more complex, more time in hospital and recovery.