24 Days after setting eggs under chicken.

[1stTimeChicken]

We've had a hen go broody and bought some hatching eggs for her. 3 out of 10 were broken over the course of time.
It's been 24 days since putting the eggs under the chicken and nothing has hatched. The bird keeps sitting on them though. Is there any chance something will still hatch? If not, what should be done? I can't believe they'd all be duds.

 

[Percheron chick]

Candle them. That will tell you if they're duds.