Depends on what you are doing. If you are just striping the old covers and installing new ones no but if you are going to sand & paint the frame install new padding too then it could.
It took me about 2-2.5 hours to remove the back seat, strip it, install new covers and reinstall the seat.
I just did the front seat (split bench with center arm rest) a couple of months ago. It took about 30 minutes to strip and recover the arm rest. Each of the seat backs took 30-45 minutes to do and the bottom was 45-60 minutes.
I have a large pair of cutters that make short work of the old hog rings and a set of hog ring pliers to install the new rings. Also, the single most important thing to make it go quickly is to through the cover in the dryer for 5 minutes just before you are ready to install. This makes the vinyl very pliable and easy to work with. Also, allows you to stretch it tight so there are no wrinkles when you are done.