I have Australorp/ISA Brown hybrids and they were all late bloomers. Their wattles and combs turned big and red about a month before laying. The first one to lay waited until around 27 weeks, the other waited another 4 weeks after that.
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26 weeks for one, 30 weeks for the other, still no eggs from one girl and she is 9 months old! she did finally do the chicken squat lol,