You can subtract the hours and the minutes separately.
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There are 7 hours from 3 pm to 10 pm.
There are 3 hours between 12:30 pm and 3:30 pm.
There are 4 hours from 10 am to 2 pm.
8:30 AM to 1 PM = 4.5 hours 8:30 PM to 1 PM = 16.5 hours
7 hours and 30 minutes