It depends on their age. For eg. an infant sleeps 10 hours and over while a 12 year old will be content with a maximum of 9 hours.
Up to 10 hours
At least 8.
You should sleep six hours in the morning.
A preteen should get around 9 hours of sleep.
They should have 8 or more hours of sleep in a day.
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
Depends on age but usually about 8 hours
At least 8 hours of sleep.
a cat shauld sleep 10-15 hours.
At least 8 hours of sleep.
9 or more hours
8 hours