8 hrs.
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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.
8 hours.
7 pm to 7 am is 12 hours 7 am to 8 am is 1 hours → 7 pm to 8 am is 12 + 1 = 13 hours.
It is 4 + 24k hours where k is an integer.
The time from 3:30 PM to 12:15 AM is 8 hours and 45 minutes.