Fertile eggs?

[AliciaM]

How long would a call duck lay eggs that are fertile once she is taken away from the male??

 

[PortugalBreeder]

From my experience varies from bird to bird and from occasion to occasion since they may have mated immediately before you take her or two or three days, you never know.
In the past I successfully hatched eggs from a bird that have been without a male during two weeks. Good luck