Well, it sounds as though they have a good home. I'd guess five weeks if they were mine, but as I said, ducks from different hatchery strains grow differently, and there are a variety of other factors. If the white is a muscovy, I bet he (possibly she, due to feather tail development, but I always say he until proven otherwise to avoid jinxing myself) is going to be really impressive looking. She looks just like Wally, my barred duck, at that age.
