Assuming that you mean 8:30 and not 8.30 (which is actually 8:18), there are (8.5 + 24k) hours, where k is any integer.
It is five hours.
5 hrs, 15 mins
From 5:30 PM to 8:30 AM the next day is a total of 15 hours. This includes the 6.5 hours from 5:30 PM to midnight, plus the 8 hours from midnight to 8:30 AM.
From 8:30 AM to 5:00 PM is a total of 8 hours and 30 minutes. This can be calculated by counting the hours from 8:30 AM to 5:00 PM, which is 8 hours, plus the additional 30 minutes.
8
It is five hours.
5 hrs, 15 mins
From 5:30 PM to 8:30 AM the next day is a total of 15 hours. This includes the 6.5 hours from 5:30 PM to midnight, plus the 8 hours from midnight to 8:30 AM.
8:30 to 5 is 8 and 1/2 hours no matter what you do for lunch.
From 8:30 AM to 5:00 PM is a total of 8 hours and 30 minutes. This can be calculated by counting the hours from 8:30 AM to 5:00 PM, which is 8 hours, plus the additional 30 minutes.
To calculate the time from 8:30 AM to 5:50 PM, first find the difference in hours and minutes. From 8:30 AM to 5:30 PM is 9 hours, and then from 5:30 PM to 5:50 PM is an additional 20 minutes. Therefore, the total time from 8:30 AM to 5:50 PM is 9 hours and 20 minutes.
From 5:30 P.M. on Wednesday to 8:30 A.M. on the following Monday is 111 hours.
8
There are 15 hours and 15 minutes between 5:15 am and 8:30 pm.
Six hours in total !
48
There are 5 hours between 4 pm and 9 pm