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How to raise ducks 
Plan ahead of time. 
Duck eggs usually take 28 days to hatch, but some breeds take as long as 35 days. You need to make sure that your incubator is prepared in advance before you purchase duck eggs and attempt to hatch them.
Duck eggs are larger than chicken eggs, so many chicken egg incubators will not accommodate duck eggs. Make sure that the tray used in the incubator is large enough.