ten
4pm = 16:00 so 16 - 6 = 10
12 - 6 = 6 and 6 + 4 = 10
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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.
21 hours
It is seven hours from 9 AM to 4 PM.
8 hours
7 hours 30 minutes.