I am a Japanese high school girl, so I am sorry if English is wrong.
Was examined in the book, it seems that 6hours to 7.5hours of sleep will make you live longer.
12 hours sleep needed
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
1,547 hours
At least 8 hours of sleep.
about 8 to 10 hours of sleep
At least 8 hours of sleep.
A nine year should be getting 9-12 hours of sleep.
Approximately 3,600 hours per year.
10-11 hours every night are the optimum hours of sleep an eight-year-old should get.
They should have 8 or more hours of sleep in a day.
13 hours sleep per day?
8 hours,,,...