36
10 hours and 15 minutes.
6 hours and 30 minutes.
8:45 AM - 5:45 PM 9 hours have passed.
6 hours and 30 minutes.
8 and 1/2
(8.25 + 24k) hours, where k is any integer.
2.25 assuming both am or pm
15 hours and 20 minutes.
There are 9 and 1/2 hours between 8:45 am and 6:15 pm.
6 hours and 45 minutes.
840