From 9:30 to 2:30, there are 5 hours. This is calculated by counting the time from 9:30 to 2:00, which is 4 hours, and then adding the additional 30 minutes to reach 2:30.
830 930 1030 1130 1230 130 230 330 7 hours
55,800 (930 x 60mins)
1460
9 hours.
8
1 month 210 hours
This is equivalent to 16 hours.
6 3/4 hours
6 hours and 30 minutes.
9h 15m
There are (7.5 + 24k) hours where k is an integer.
4 hours and 15 minutes.