ten and a half
17:30 - 07:00 = 10:30
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It is 21 hours.Note: 10 am to 10 pm is 12 hours, 10 pm to 7 am is 9 hours, 12 + 9 = 21
9.5 hours (9 hours 30 minutes) between 7am and 4:30pm.
There are (13 + 24k) hours where k is an integer.
7.5 + 24k where k is any integer.
The time from 7:30 to 5:30 is 10 hours. This is calculated by counting the hours from 7:30 AM to 5:30 PM.