It is 9.5+24*n hours where n is an integer.
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7
6
Ten hours.
10.5 + 24k hours where k is any integer.
From 9:30 pm to 12:00 am is 2.5 hours, then from 12:00 am to 7:00 am is 7 hours. Therefore, the total hours from 9:30 pm to 7:30 am is 2.5 + 7 = 9.5 hours.