The surface is sanded, dusted, and the surroundings protected, then the primer applied. After the primer dries, the surface is sanded and dusted again, before the paint layer is applied. After that dries, repeat again for the second finish coat. If the adjacent surface will be a different color, it can’t start until the first surface is completed. It seems to be about 8 hours of prep and 2 hours of painting for every 10. Baby steps.
Today however, as some surfaces are finished, some of the plastic barriers are coming down.
Usually nobody works on the weekend, but the painter is going to come back tomorrow to finish up his part here.