The PM (Post-Meridiem) part of the day contains exactly half of the hours of the 24-hour day, so there are 12 hours in the PM.
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21 hours
2 hours.
There are 16 hours from 4 am to 8 pm. 4 am to 4 pm is 12 hours, then 4 pm to 8 pm is another 4 hours.
It is seven hours from 9 AM to 4 PM.
3 hours and 30 minutes.