I would stick with 10 max just because you dont want to slow egg production down due to overcramping! I can definately see what i can find around the couple month range! As long as your not to picky about what breed they are.
Im in the Des Moines area and know of lots of different people that are selling chickens right now! Looking for full grown or babies? I personally have silkie chickens and they are very popular but smaller chickens meaning smaller eggs. I can help you find any other breed your interested in! Do...