Assuming 9:30am to 1:30pm or pm to am, 4 hours, if am to am or pm to pm, it is 20 hours.
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.
2 hours from 1130 pm to 130 am 14 hours from 1130 am to 130 am
9h 15m
There are (7.5 + 24k) hours where k is an integer.