I’ve agreed a price for having my entire house painted inside, 2 coats on every surface. The decorator said he’d take 2 1/2 days per room. He’s part way through and, at this rate, it will take more than 3 weeks. He only works 9 to 1 most days. The house is a 2 Up-2-Down plus bathroom extension, very old so needing lots of preparation. Is this reasonable?