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7 hours and 30 minutes.
8 hours.
Nine and a half hours.
840
Nine hours.
4.5 hours
9hours 30minutes or 9.5hours
ten and a half
8:30am to noon is 3.5 hours.
It is (8.5 + 24k) hours where k is an integer.
2 and 1/4 hours
8 hours and 30 minutes.