Ds is 6 and in K, he sleeps between 10-11 hours a night (7:30 bedtime, wakes up by 6:45), he does much better when he gets 11 hours.
Dd is 2.5 and she sleeps at least 12 hours total. Sometimes she takes a 30-45 minute nap before we have to pick up ds from school so her bedtime is 7:15. If she takes no nap at all, she is in bed by 6:45, which is increasingly common. She is usually up for the day about 7.