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Confidence votes 27. This would depend on the breed of chicken you own, but roughly, the chickens will be at least 4 months old before you see the first eggs being laid. There are some breeds that will not produce eggs until they are over six months old and even then, they may only lay one or two eggs per week. Correct.
Tipically, a well fed chicken, with proper living conditions and from a good breed (such as Isa Brown) should start laying eggs at week 19 or 20. It will reach its peak of production between week 25 and 30, then it will decline but the bird will keep laying eggs until a very old age.