Including nap (if your LO still naps), how many total hours does your preschooler (3+ years?), sleep?

Lil' CB is dropping to around 11ish hours and I feel like it's really not enough! He goes down around 7 and wakes up somewhere between 6-6:30 am. But if he naps, he doesn't fall asleep until 10:00 or so and is up every day at or before 6:30, so he actually sleeps less when he naps! Gah! Will sleep every be easy to figure out?!