I've changed two so far.. If you have a lift, you could do it in 2 to 4 hours.. as long as all your studs stay on.. If not, it might take some time getting them off and putting them back on..

If the studs come off.. Make sure to mark which ones and where it came off of.. If you put them back on the same location, you don't need to take the nuts off of the studs..

Good luck!