How long before i can hatch eggs?

[peanut2052]

Yesterday i obtained 4 sulmtaler chickens, rooster and three hens. They were free range with lots of other chickens. I have them penned in a pen by themselves. How long before i can incubate the eggs and have pure bred eggs? I dont want to have mixed breed chicks, just purebred. I did get two eggs this morning? Thanks

 

[Nocila]

I believe hens can lay fertile eggs for about 4 weeks after being mated, but I could be wrong on that...