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You should continue to incubate the eggs after the outage; then candle them 4 to 6 days later to check for further development or signs of life. If, after 6 days, you do not see life or development in any of the eggs, then terminate incubation.Most of the time, a power outage will delay hatching by a few days and decrease the hatchability to 40-50 percent. Humidity The relative humidity of the air within an incubator should be about 60 percent.During the last 3 days (the hatching period) the relative humidity should be nearer 65-70 percent.ost of the time, a power outage will delay hatching by a few days and decrease the hatchability to 40-50 percent. Humidity The relative humidity of the air within an incubator should be about 60 percent. During the last 3 days (the hatching period) the relative humidity should be nearer 65-70 percent.
Best Answer: From Ducks Unlimited, Canada: I found a nest in my yard with mallard duck eggs. How long will it take the eggs to hatch? On average, a mallard hen (female) lays one egg per day for about nine days.She will incubate the eggs for about 26-28 days before they hatch.Once hatched, it will be about 50 days before the ducklings can fly.he will incubate the eggs for about 26-28 days before they hatch. Once hatched, it will be about 50 days before the ducklings can fly.