12/2*3=18hrs
8-9 hours
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
As a general guideline, teenagers require about 8 to 10 hours of sleep, and adults require around 7 to 8 hours of sleep.
As a person gets older they require less hours of sleep and can actually function better on a lower number of hours. Typically when you get older you have a harder time sleeping and only get about 4-6 hours of sleep a night.
1,547 hours
about 8 to 10 hours of sleep
At least 8 hours of sleep.
At least 8 hours of sleep.
A four year old should sleep 12 hours a day
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.