Unless the chickens have figured out a way top dig a hole in the dirt, drop the egg in and cover it up and pack it back down, we've got no eggs yet.
So, my initial prognostication of eggs on Labor Day didn't come true, but I still think September's the golden month. The folks at McMurray Hatchery say chicks start laying between 5 and 7 months of age, whereas the My Pet Chicken FAQs says it's 4-5 months.
A Manitoba (Canada) government web site has this nice little PDF on Egg Size and Your Small Flock of Laying Hens with this little tidbit in it:
Lighting programs influence egg size by accelerating or delaying the age at which hens start to lay eggs. The younger a hen is when she starts egg production, the smaller her eggs will be during her first year of life. The start of egg production can be delayed by providing 10 hours or less of light each day to 19 weeks of age. Decreasing the daily hours of light at any time after 10 weeks of age will also delay the start of egg production.We haven't done any artificial lighting with our girls, but considering the fact we've been in midsummer light for a couple months now, I don't think the light's affecting their time of lay.
I just have to be more patient with them and be happy with an egg of any size when it first comes (given the size of Sophia's vent and the width of her "hips," I think she'll be the first to lay).