I had mine removed about two years ago. They were impacted so I was put under during the procedure. Didn't take long at all. Came to in a separate room than I had been in, which confused me, but I guess I had already been conscious enough to be lead down the hall to this separate room where you are put in to recover from the anesthesia a little bit more.
Didn't hurt for maybe an hour after, but that was probably because the anesthesia was still working. Once it had worn off, I was in a world of pain. Had to replace the cotton they put in several times. But once the bleeding had calmed down a little bit and I had my prescription pain meds, I was more or less all set. It did hurt for at least a week though. If you get something prescribed for the pain, I suggest taking advil in-between the dosages so you don't use your whole prescription up in the first couple days (like I did).
This probably wasn't very reassuring. I've known plenty of people who have gotten their wisdom teeth out and didn't have to deal with hardly any pain though. I think it is different for everybody, I'm sure you'll be able to ride through it just fine. I also smoked cigarettes which make your gums more sensitive which would explain the increased pain I had to deal with.