9 to 5 is 8 hours. 10 minutes on the front and 30 minutes on the back is 8 hours, 40 minutes. Subtracting 45 minutes is 7 hours, 55 minutes.
9 hours
530 minutes is 8 hours, 50 minutes.
1460
7.75 hours
This is equivalent to 16 hours.
1360
9
This is equivalent to 16 hours.
Ten hours.
4.5
8 hours and 30 minutes.
5 hours 30 minutes.