24 hours.
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One day is 24 hours, half of that is 12 hours.
1350
7 and one half hours = 15 half hours. There are 24 hours in a day, so there are 48 half hours in a day. Therefore the answer is 15/48, which can then be reduced to 5/16.
6 hours
9 hours is 37.5% of one day