If your duck has several egg's and she is leaving them daily or if you have more than one duck hen she may not be ready to brood the egg's yet. Ducks lay a clutch of egg's just like chicken's.Depend's on the duck. Sometime's young mother's will sit on egg's for a while and then just leave them.It takes standard duck egg's around 28 days to hatch.Muscovy ducks around 33-35 days'.