When will my hens start laying?

[hnt15]

I have 2 leghorn and 2 ima red that started laying at 18 weeks but also have a sebright bantam and an alstrap that are not laying yet do these breeds take longer to start laying??? They are niw over 20 weeks old.

 

[CoopintheWoods]

Don't worry. Some breeds can take up to 28 weeks to begin laying.