At least 6-8 hours of sleep. For every two hours of sleep you miss per night you can actually reduce your lifespan by one year. Each person however has to develop their own sleeping patterns, your body may need 8-9 to feel fully refreshed.
about 8 to 10 hours of sleep
8 hours,,,...
12 hours
I'm quite sure they need at least 7 hours.
Children need 8 hours.
9 - 10 hours
8 - 10 hours.
Depends on the length of your "sleep cycles", but generally 7-9 hours.
10-11 hours every night are the optimum hours of sleep an eight-year-old should get.
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Most adults, including those who are 68 years old, generally need 7-9 hours of sleep per night for optimal health and well-being. Individual sleep needs can vary, so it's important to listen to your body and adjust accordingly.
if you mean how many hours you should sleep in a year it would be 3,650 hours of sleep for a regular year not a leap year