Ok I have a master builder for almost 2 days. The other one is so close but I just can't get her there. She is always working, but still says adept builder. I am trying to open the stupid box on the beach. I assume I need two to accomplish this since the master says he can't do it alone. She is my only female who is of breeding age. I am torn as to either breed her again since I only have 9 villagers since I bought the game on Thursday or waiting it out for her to get her master skill.