How long past due date do you wait?

[princess araucana]

Hi,
A friend is trying to hatch a single egg in one of those very simple plastic dome incubators.
Yesterday was hatch date, how long should she wait to see if anyone is in there alive?
She did not candle early on.
There was some question to fertility.
thanks!

 

[lockedhearts]

I have had them hatch as late as 25 days, from what I have heard those little incubators do not hold temp well so it could be slow.

 

[The Sheriff]

Quote:
Ditto

 

[chickeypeep101]

Yes I would wait until day 25.

 

[azrc]

I'm on day 25 and there is still one, possibly two, eggs that is in the process of hatching (shell broken away, beak sticking out and moving).