my 8 month old goes to sleep by 10-10:30 on good days. normally 11 or 12

My 11 month old goes down by 9:30 on good days, lately it is thrown off because of a growth spurt and she doesn't go down until super late....so far today she is back on track, she just knocked out at 9:38 so I am praying tomorrow will be the same!!! She usually wakes around 8am, and takes only one MAYBE two naps during the day if I am lucky LOL

Lucas is 7 months now and he's out by 8-8:30