It takes 3 full days for the hens radar to reset. While confined they are programming their location and also they are getting used to the way the sun rises/sets/watching for predators and doing a lot of noticing. This is a very important step in rehoming birds of any kind. Do not skip confining them for three days to allow them to make the adjustment.
If you have other chickens, or you plan to get more, then take a fecal sample to your vet and have it checked for worms and coccidia BEFORE you let them walk around your property and poop all over your soil. That way you can treat these chickens you need to before they contaminate your soil. Some parasites can take years to leave the soil, making it very unhealthy for your current flock or any future chicks you might have.
Many people on BYC keep their new chickens separate for a month from their existing flock in case of other disease. But the fecal test at a vet is a quick way to get much information about your new hens and if they have any other symptoms of any kind (scaly legs, sneezing, anything unusual) consult a vet before adding them to your flock!
