It takes a lot longer than a couple of hours to complete the puzzles!

The puzzles are not usually completed in order, either. The new huts won't be constructed by your builders until your population grows enough to need them. Most of the puzzles are dependent upon some combination of Village Tech, population, and other puzzles. The best thing to do is to keep your tribe healthy and fed, and continue to have them research new technologies. After every tech purchase, drag one of your adult villagers around the island and look for new things that they can work on.