6 of them.
Working from 8 AM to 2:30 PM is a total of 6.5 hours. This includes 6 hours from 8 AM to 2 PM, plus an additional 30 minutes from 2 PM to 2:30 PM.
From 10 PM Saturday to 8 AM Monday is a total of 10 hours. It includes 2 hours from 10 PM Saturday to midnight, and then 8 hours from midnight to 8 AM Monday.
It is 24 hours.8am to 8pm = 12 hours.8pm to 8am = 12 hours.2 x 12 = 24.
2 hours.
There are 2+12k hours where k is an integer.
6 hours.
Working from 8 AM to 2:30 PM is a total of 6.5 hours. This includes 6 hours from 8 AM to 2 PM, plus an additional 30 minutes from 2 PM to 2:30 PM.
It is 24 hours.8am to 8pm = 12 hours.8pm to 8am = 12 hours.2 x 12 = 24.
On the same day 2 hours
2
2 hours
2 hours.
7 and a half hours
There are 4 hours from 10 am to 2 pm.
8am to 5pm is 9 hours, deduct 1 hour for lunch = 8 hours. If they're both in the same day, then 8am to 5pm is a span of 9 hours, regardless of how you choose to use them.
2 hours
Because your calculation could be 12 hours out ! The difference between 8 o'clock and 10 o'clock is 2 hours. The difference between 8AM and 10PM is fourteen hours !