I think I got scammed
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I always thought it would take a while, but friends have gotten chickens of laying age that started laying the same day. I honestly don't know if it depends on the individual bird's temperament or if you got scammed. I'm curious to find out though...
That said, if you're getting chickens solely for egg laying, I'd recommend only getting them when they're obviously young and not full grown.
Welcome! Generally craigslist is not the best place to get chickens, especially as a new chicken owner. Any stress can affect egg production, for an unknown length of time. Good food, treating for mites/ lice/ whatever, and time, might do the trick. If they are molting, or elderly, and fail to produce, either enjoy them and get better birds, or just move on. I'm paranoid about biosecurity, and so NEVER get random source birds. Good luck, Mary
Agreed, 3-6 weeks is not uncommon. Also like previously stated, the could be molting which would delay laying. Also could be older than you were told. Which also will delay laying longer.