I don't have kids but my nephew Dillon and niece Desiree who are twins and will be 9 in June still take an hour nap in the afternoons (like from 3 to 4). They go to bed around 8 and sleep until 7.
My other nephew and Dillon and Desiree's baby brother who is only 5 weeks old sleeps most of the day like most young baby's do.
My other older niece Lily Belle who is 5.5 gave up her naps at 2 years old (she was taking a 2 hour nap and then went from taking no nap). She sleeps about 12 to 13 hours at night and has since stopping her nap.
My 3rd niece and Lily Belle's baby sister Dani Mae takes Three 30 minute naps a day. She won't sleep longer then that and if you try and keep her awake longer then she will be crabby and won't sleep at all lol.