We have four pullets that were hatched in April. We had a rooster that we had to cull because he was too aggressive with the chickens and the children. A few days later, we adopted four hens from some friends. They were laying already. We figured with the rooster newly gone and a new pecking order being established it would be a good time to add them. It all went great! There was some minor chest bumping and a little chasing but they have it all figured out now. One of our original girls appears to be the head chicken. About how long does it usually take for hens to resume laying when they are introduced to a new chicken family?