9
8 hours.
8 hours.
9 hours
Nine hours.
8 hours, 45mins
Four hours and thirty minutes.
one hour
7am to 4pm is 9 hours.
7am to 4:30am is 21 hours. 7am to 4:30pm is 9 hours.
8pm to 7am is 11 hours.
(6.5+12k) hours where k is an integer.
11hrs 30 minutes