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If they are fertile, they should. It takes 26-28 days for them to hatch. Once it reaches 30 days, and they haven't hatched, it can be assumed they are duds.

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12y ago
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16y ago

about 28 days for Mallards

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Q: Will duck eggs hatch if the mother has been sitting on it for 3-4 weeks?
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A quail has been sitting on her eggs now for abut 3 weeks and you are wondering if they are going to hatch at all This is Arizona and it is very hot right now?

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