Yes. 2 days for initial sanding could be enough. Double that in your mind, though, so if it does take longer you don't get discouraged.
Paul repaired and repainted our 73 brown amerigo
but he did it in sections working around repairs weather, tarping, etc. If you could just forge ahead all day long, two days might be about right. Brush marks! Awful!
Paul used a foam roller with white marine enamel. There's a method called "roll and tip" where you roll and then go over it carefully and lightly with a brush to pop all the bubbles etc., but Paul simply rolled it, hard at first, rolling and rolling until all the bubbles were popped and gone. The marine primer he kept thin and sanded after it dried.
The marine enamel flattened itself; he worked each area until it was as smooth as he could get it. He kept it fairly thin and sanded it again when it was dry, with super fine grit and rolled it a 2nd time, again, working it in well and finishing each stroke to feather into the painted aireas.
It was a lot of work, but we had such a mess to cover, including new patches, fairing, priming, and that brown.
Wishing you good luck. Many tips on FGRV about painting
...you can go into the search (type in what you want to find at the bottom of the search pop-up, not the top).
Wishing you happy an successful painting! It was one of the most fulfilling things we did when rehabbing "Peanut." (one shell, two nuts)
Kai in Seattle