How long can a chicken egg last without its mother?

Answer 1

Under ideal conditions, Dark, damp and cool, a fertilized egg can still be viable for up to 7 days. Eggs left in a nest with no broody hen to set on them should be thrown away after day 8. They will not be suitable for hatch or for eating.

Answer 2

A hen does not lay fertillized eggs unless there is a rooster in with her. So if you have no rooster with the hens, you should not get fertillized eggs.