Egg troubles

[TeenDuckLady]

How long after 28 days should I leave an egg in the incubator?
I have 2 that were 28 days yesterday, but nothing is happening?
how long should I wait?

 

[JadeComputerGal]

The 28 days you always hear for domestic ducks is just a close approximation. I don't have any experience with incubating, but two of my Buff eggs from summer took 31 days after the hen started sitting on the nest.

That being said, have you candled the eggs to make sure they have living embryos in them? If they do, just let them go for a few more days and you should start to see some pipping.