There is no such time as 12 pm. There is 12 midnight and 12 noon. It is therefore impossible to answer the question.
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There are 12 hours from 9 AM to 9 PM. This includes the full hours from 10 AM to 9 PM, plus the hour from 9 AM to 10 AM. Therefore, the total duration is 12 hours.
It is 21 hours.Note: 10 am to 10 pm is 12 hours, 10 pm to 7 am is 9 hours, 12 + 9 = 21
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From 3 AM to 8 PM, there are 17 hours. This is calculated by counting the hours from 3 AM to 12 PM (noon), which is 9 hours, and then adding the 8 hours from 12 PM to 8 PM.
13 hours. 8 pm to 12 am (midnight) is 4 hours. 12 am (midnight) to 9 am is 9 hours. 4 + 9 = 13 -- 13 hours of sleep (if you fall asleep exactly at 8 pm and awaken exactly at 9 am, have not awoken in your sleep, and have not changed timezones)