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8-9,5 hours. I sleep badly, so I need about 9-9,5 hours to feel actually somewhat refreshed.
By the way; old people sleep less than young people, not more. Well, at least naturally as old people need less sleep. All the gramps go to bed "late" and wake up early morning and feel swell. Young people may do that as well, but they feel like shit and drink lot of coffee, red bulls, take medication, etc.
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