proboblly 9 to 11/2 hours.
AnswerHe should probably get about 9-1/2 hours.As per:
http://www.webmd.com/parenting/guide/sleep-children
7-12 Years Old: 10 - 11 hours per day
At these ages, with social, school, and family activities, bedtimes gradually become later and later, with most 12-years-olds going to bed at about 9 p.m. There is still a wide range of bedtimes, from 7:30 to 10 p.m., as well as total sleep times, from 9 to 12 hours, although the average is only about 9 hours.
You will find all the sleep requirements for children from newborn to 18 years @ the above link as well.
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
They should have 8 or more hours of sleep in a day.
A nine year should be getting 9-12 hours of sleep.
At least 8 hours of sleep.
A four year old should sleep 12 hours a day
At least 8 hours of sleep.
8 hours
A ten year old should sleep at least 8 to 9 hours a day.
A 5 year old should sleep around 10 to 11 hours and adults should sleep around 7-8 hours.
13 hours sleep per day?
An 8 year old should get 8 hours of sleep because that's what a doctor would recommend
A 17 year old man should have about 7.5-8 hours of sleep each night.