It is five hours.
5 hrs, 15 mins
8:30 to 5 is 8 and 1/2 hours no matter what you do for lunch.
From 5:30 P.M. on Wednesday to 8:30 A.M. on the following Monday is 111 hours.
There are 15 hours and 15 minutes between 5:15 am and 8:30 pm.
8
Six hours in total !
48
There are 5 hours between 4 pm and 9 pm
There are 2+12k hours where k is an integer.
5 hours and 30 minutes.
12 hours