adding hens question

recently was given 3 hens to me from a freind to add to mine and thin out his i have been around these birds since born and have been reading about the quarentine phase and all and how stress affects them laying but my question is how long will they stop laying for ??? i dont want them to be stressed but being ripped out of your home and away from freinds/family is traumatizing so i expect them to stop laying but i just dont know for how long they will stop. havent yet introduced them to my girls and kinda wondering about that also since these hens are all just over a year old and my girls are just over 4 months