All my chickens are 18 wks old. How much longer do I have for any of these. 6-RIR, 8- BR, 2-GLW, 1-WL and 1-CW. My wife is one that's interested, I told her they'll probly be around 22 to 24 wks old before they start. I'm going to go and hang me a light for them tomorrow and set-up my timer, that'll help from what I understand.