I’ve heard chickens can lay eggs every 1-2 days. It baffles me that something so (relatively) big can come out of them so often. How do they produce so many with such limited internal space? How many are developing in them at any given time?
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Domestication.
Most wild fowl has a laying season and can lay an egg a day in that season. Chickens are domesticated and bred to lay for more of the year. Even still a breed that lays an egg a day will have about a 2 month period of not laying anything while they molt. But artificial light, warm, and steady food supply encourage a longer egg laying season then the same chicken would have in the wild.
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