My DS is 18 months and is usually down for somewhere between 10 and 11 hours, sometime less, but I do my best to get a minimum of 10 hours. He only naps for 1.5 hours during the day at most, but seems to get by on around 12 hours sleep a day... I think they're all different and just need different amounts of sleep. As long as she's happy I wouldn't worry. I have found that it doesn't make any difference what time DS goes to bed he still wakes up at the same time (usually around 5am, 6am on a good day). HTH