Leghorn/ Brahma maturity questions

[Mrs. Foghorn Leghorn]

How long will it take for them before they start laying their first eggs?

I have 2 white leghorns and 1 Lt. Brahma. They will be 3 mo on Tuesday the 15th. (Born April 15th)

I thought I heard 5 or 6 months, but I didn't know if seasons affected this or what.

TIA

 

[Mrs MIA]

Every bird is different, but that should be about right.