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How to Hatch a Mallard Duck Egg. Mallard ducks are amazing animals. And sometimes you want to help them hatch. It's important to not remove wild ducks eggs from any nest without the proper cause; however, if the mother is confirmed missing for over a period of 48 hours, you may be able to help.Ad. Call your local office, and ask them if you can raise these wild ducks from eggs, in an incubator you bought, and release them in exactly 60-90 days, which is their fledging time (how long it takes to fly) to a nearby lake in your town. 2  Notify them that the mother duck has been missing for 48 hours.