If your 4-5 year old doesn't nap

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If your 4 or 5 year old doesn't nap how much do they sleep at night?  DD sleeps from about 8:30 or 9 (except in the winter she's usually in bed at 8) until around 7.  Sometimes I feel like she doesn't get enough sleep but she will not nap at all.  I am just curious where other people are at at this age.