Well I just have the two seat but I would say probably around 4-6 hours if I remember right. Not in a big hurry. Getting all of the plastics off and then getting the bracket mounted inside the inner fender is kind of a big pain in the ass! Very functional once installed and door goes on and off with one bolt.
Only took me about 3 hours to install my Hi Boys... I think they're the best looking mass produced doors on the market. Fitment is super nice. You will need to replace some rivets tho in the rocker panels since you need to drill em out. Plastics took me about 30 mins... First door took about an hour and a half and the second is easy as cake once you figure out how to get the first one on. I think I may replace the silver screws with some black ones tho. Instructions are good... Very easy to understand. Cant comment on the MAX tho since I am sure it may be a little different especially for the rears.