From 8:30 AM to 5:00 PM, there are 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.
4.5 hours
ten and a half
1960
There are 4 and 1/2 hours between 8:30 and 1.
1 hour 34 minutes 0:30 + 1:00 + 0:04
8 hours.
4.5 hours
840
Nine and a half hours.
Nine hours.
ten and a half
It is (8.5 + 24k) hours where k is an integer.
8:30am to noon is 3.5 hours.
8 hours and 30 minutes.
1960
14 + 24k where k is any integer.
There are 4 and 1/2 hours between 8:30 and 1.