I think it depends on the person too. I had gallbladder surgery (FULL of gallstones, gallbladder was 3 x its normal size and working at 2% by the time of surgery) last February, and it took me 5-6 days to feel 'normal' again. I went back to school for a half day on my 5th day and I was hurting at the end of that. They had to make two incisions on me, one through my belly button and one on my side. The one on my side was nothing, though I do have a scar from it. My belly button was about 2", in a cresent shape. I was black and blue there for a little while and I did have to stay at the hospital two days instead of one because I got a bit of a fever and threw up (WORST EVER) but once I was home I was fine. The worst part I remember was sitting up by myself the first few times.
If they are just removing the stones and not the gallbladder it self, I'd think you won't have too much pain. You can't ride for 6 weeks though.
As for what to expect after your surgery, in your gallbladder is actually being taken out, don't eat anything with spice. To this day it still hurts me, and at least for the first few weeks, don't eat anything with more than 5g of fat or so.
I wasn't eating at ALL and had lost 14 pounds (only weighed 95 to begin with) before having mine out, so the surgery was a relief. I've found though, that in the last 6 months instead of getting better, I've been having a LOT of liver problems lately, because my liver isn't being regulated by my GB anymore, so it is creating MUCH more bile than it should be. This causes a lot of small intestine irritation for me, as well as severe acid reflux (I take 80g of a high power anti acid daily) and I'm very limited on what I can eat. Citric acid bothers me, spice bothers me, fat bothers me, great bothers me, and I've become severely lactose intolerant as well. I also developed 3 food allergies after having the surgery but I'm hoping that was a coincident.
Still, I don't have the same pain anymore so I'm grateful for that at least.
Now that I've scared you(sorry!) please don't worry too much. It sounds like for the majority of people the surgery really isn't too bad. I have a LOT of health problems that complicated my case so stories like mine really aren't too common I think.