So you are talking about replacing the top with a new one? I just replaced my top, (leaving the frame on the car,) and it took about six hours, taking my time and not really paying attention to directions -otherwise it would have taken a lot less time. A new rain rail was already riveted to the new top, though, otherwise it would have taken significantly longer, especially since the rain rail on the old top was in pretty bad shape, and cracked more when moved.
It wasn't very difficult for the most part, just tedious to get at some of the nuts, bolts, and rivets.
Hope this helps.