Answer:
First of all, you should check will your local hardware store about such issues as fire safety, heating and cooling. Repairs in this department could take anywhere from an afternoon to months, depending on what needs to be fixed and how you plan to address it. Once you are sure your room is safe to be turned into a bedroom, you can decorate it! This can be as simple as moving furniture in, or as difficult as painting, building new furniture, and creating decorations. Time can vary significantly, so to answer shortly, it depends, because it could take more than a year, or it could take a few hours.