How old are hens when they start laying? How long before eggs reach full size? How long do they lay?
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Start of lay varies by breed, line, and climate factors. Since your avatar shows a Red Sex Link then you can say they should be laying by 26 weeks old, can start as early as 18 weeks. All my hatchery production birds started laying between 22 and 24 weeks.
The pullet eggs will get to consistent shape and size in a month. Eggs do continue to get bigger as the bird ages. They will lay until first molt as a hen then seriously slow down or stop altogether for 3 or even more months. After each yearly molt there will be a reduction in quantity but eggs will be a bit bigger. She will lay from molt to next years molt. How many years? It's up to the hen and breed. Production Reds I had were slated for culling in fall when they were 2.5 years old, fair layers but knew by next molt end and even fewer eggs they'd past usefulness. One died of internal laying that summer before culling. Common problem with production birds, seems to happen during third year like mine.
So what are the best hens for a beginner who just wants a few eggs for the family and a hen that can be handled and not aggressive