When will laying start?

[LittleWhiteDove]

Hello everyone,
My puppy somehow got a hold of my past hatch records and ate them. I came home to an office covered in tiny shreds of slobbery wet paper, and my puppy happily rolling in it
I don't know how old the chicks are but I fore sure have two hens, two roosters, and one that I am not sure what it is yet as its Serama size and a very rich black and extremely hard to catch or get a decent photo of. the two roosters for sire started crowing today. So my question is this, how long once the boys start crowing will the girls start laying?

 

[lazy gardener]

Really impossible to tell, based on breed, nutrition, hours of day light when the pullet "could" be reaching sexual maturity. Easier to tell based on her appearance and behavior. She'll give tell tale signs that laying is imminent. Cockrels reach maturity before their sisters do. That's why it's advisable to separate them when the boys start acting jerkish.