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Not all ducks take 28 days. Bantams and calls take less, and muscovies take longer. I have heard both 23 and 26 days on calls, I think mallards and BEI take 26, so whichever is closer in size to the ones you have, that's what I would go with. It can take up to 48 hours for the duck to hatch after pipping the shell, so it can be even longer if it's just in the air cell. I have hatched ducks, just never bantams. It does not hurt them to stop turning a few days early. I have had many birds pip while still in the turner, so I think it doesn't matter if you turn them too long either!