How often do chickens lay eggs?

According to BackyardChickens.com, hens lay eggs anywhere from once every 24-25 hours to once or twice a week. A hen's egg-laying routine is influenced by her breed, the amount of daylight, molting, seasons, temperature changes, illness, stress, nutrition, the availability of feed and water, or other disruptions.

MyPetChicken.com explains that high egg-laying season is summer, with fewer eggs laid in the winter. Chickens generally do not lay eggs in the dark. Some are bred to lay eggs only, and others for both egg laying and meat. BackyardChickens.com states a hen begins laying eggs at four to five months of age and continues for several years.