An incubator.
Put the duck egg under another broody hen or bring it inside and place it in an incubator.
Put it in the fridge. If you are hatching it, then use an incubator.
With a Momma Duck! Or you can use a broody hen, if you have chickens.
About 10-13 eggs in a clutch.
Duck eggs should be kept at a temperature of around 99.5°F (37.5°C). This can be achieved by using an incubator or a broody duck for natural hatching. It's important to maintain a consistent temperature throughout the incubation period for successful hatching.
by incubator or with a broody hen, hatch them the same way you would hatch Any other duck egg
never
Just use an electric blanket beibg careful with the heat selection of course.,
take it to an incubator in taverly when you have level 70 summoning.
That egg will not hatch. Take it out. Bacteria will grow in it and also the moisture has all been lost. You do not want it to affect your other eggs that are in the incubator.
As soon as it is hatched! But, if not, within 25 minutes.