Rouen Duck Eggs, Hatching Late?

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Hi again! Woke up this morning and checked on the eggs, nothing. None pipped. Should I open one of the eggs? I know that I should be patient with it, but any advise? Why would the eggs be late?

Just saw your post today. How did you make out with your eggs? I'm hatching Rouen duck eggs. I 'm on my 14 day.