It really depends on many factors such as breed, age, amount of light, nutrition, temperature, etc. Younger hens tend to lay more regularly than older ones. The heat/cold and a decrease in the amount of light per day also can decrease how many you get a day. Hens that get a good ration of laying feed, clean water, and some greens generally lay better than those given inferior feed (such as straight grains/corn) or no feed at all.
Right now we are getting 2 eggs a day from 5 laying age Buff Orpington hens.