thats ok I'm beginning to think Sally has way under bid the initial project. I cant see anybody painting a house in 4 hours, even if she used a power painter, I mean you got setup, masking, drop clothes, etc.
I think Dred is right we need more information before any kind of reasonable answer is given... if its a 2 bedroom house, under 1500 sq, two colors, house and trim and no repairs needed before painting and no shrubs or trees in the way, I'd say two days for one person. Now if she has hired additional undocumented labor then maybe in one day. but then John will call INS