Depending on the health and the breed, Some  Breeds mature sooner than others, But you can expect to start getting
eggs  when your birds  reach 4 to 8  months  depending on the health and the breed, At first it is doubtful  you will get 1 egg a day from every bird, But   as  the weeks pass  soon  you will get 1 egg every day from  every healthy  bird and this will continue  for up to 9 - 12  months  then they will molt  and
 go thru some changes   they take a month or two  off from laying then they will start all over again,  Very rare is it you will get more than 1 egg a day from  any  chicken.
 
  hope this helps
 
 

 We've raised chicken for over 30 years. One thing that the other response didn't mention is that if they are moved they get stressed and stop laying for awhile. However, they will start laying again. The older the chicken the less eggs they lay. The closest thing to getting more than one egg from a chicken is a double yolked egg.