0
Anonymous
9 am to 3 pm is a six hour period.
Wiki User
12 hours.
eight and a half hours
21
From 9am to 6:30pm is 9 hours and 30 minutes.
6 hours
5 Hours
21 hours
There are zero hours between 9 am and 9 am.
11 hours
16.5 + 24*k hours where k is any integer.
13
5.7