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Depends on the 12 year old. Children usually start with 15 hours of sleep a day, and then average out around 8 hours of sleep, and eventually get less as they get older. If you assume the 8 hours of sleep a day that means they sleep 1/3rd of their life, so 4 years of sleeping. However, it's likely a little more than 4 years, probably more like 4 and a half to 5 years given the higher amount of sleep needed by young children.

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11y ago

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