I gutted my 27' '72 all by myself within a week. Take a look at my web site for pics of how things went.
Todd Created Wood, TP drums, Custom Furniture Design, Wood Worker, Carpenter, Fine Furniture, Tables, Chairs, Cabinetry, Stave Drums, Snare Drum. I still have it all apart. The issue is not how long it will take you to gut it. Because it is certainly possible to gut it pretty quick, depending on how much you plan on saving. The issue you want to consider is; what do you think you will find when you do gut it? I have spent a lot of extra time chaising problems and making fixes to things I thought I wouldn't have to pay attention to. For instance, this week I had to remove the interior rear fiberglass end cap to get at leaks that where behind it... I hadn't thought I would be going there... Just because you gut it doesn't mean you can rebuild immediately. Look carefully for evidence of past leaks and strucural damage.
The actuall gutting in my case was pretty quick and easy. I wasn't saving anything.... There are lots of screws and rivets to take apart, that is the most labor intensive event.