I have some 1+ year-old hens and a rooster. I'm getting 10 chicks in June 24 (5 buff Orps and 5 gold Wyandottes). I plan to keep the chicks in separate separate heated housing for a while. The problem is that we are heading out on a 2-week vacation to Montana & Wyoming on July 14. I've got some good neighbors who will take care of the chicks and adults while I'm gone. At what point is it safe or advisable to put the growing chicks in with the adult hens and rooster? Sounds like around 60 days or so?