How many hours of sleep a school going 6 yr. kid should get daily?

At this age kids need to sleep between 10 to 12 hours. When the kid has slept well, he can focus well on his studies or any sport or anything he does. It also has an impact on his overall physical and mental health. http://www.webmd.com/parenting/guide/sleep-children#2 http://kidshealth.org/en/parents/sleep.html#