how long can a chicken stay fertile?

[erik520]

So everone says that thay will keep fertile for 3-4 weeks. Now if she doesn't lay untill it warms up, 2 to 3 weeks or longer. does it start from the time she lays, or when the last conception took place?

 

[RHewitt]

From conception. From the last day she was with a rooster wait three to four weeks.