How Long Do Mallard Ducks Sit on Their Eggs?

Answer

When a mallard duck has laid enough eggs, which may take weeks, she will begin sitting on her eggs. Twenty-eight days is the average time a mallard duck will sit on her eggs, though she may sit for longer if the eggs are taking longer to hatch. If an egg hasn't hatched within 35 days, it is a bad egg and should be thrown out.
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