How much sleep for a 3 year old?

my 3 yr 1 m boy goes to bed usually by 7:45, is asleep around 8 pm. this sometimes varies if we are out for dinner with his grandparents.

he wakes up between 6-7am (usually around 6-6:30am).

he usually sleeps for about 1-2 hours in the early afternoon.
 
My almost 3 year old (turns 3 in 2 weeks) goes to sleep around 8:30 pm and wakes up at about 7 am. Since she attends afternoon nursery class, she naps at 3:30 pm for about 1-1.5 hours so she cannot go to sleep earlier than 8:30 pm.
 
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