11 hours
one hour
how many hours is 6:30pm to 6:30am
4 and 1/2
That would be ten and one half hours.
7 hours and 30 minutes.
9 + 24k where k is an integer.
4 hours and 15 minutes.
From 9am to 6:30pm is 9 hours and 30 minutes.
Between 10am and 9pm, there are 11 hours.
10am to 4pm is a period of six hours.
It is 18 hours from 10AM to 4AM. You can figure this out in a few different ways. 10AM to 10AM is 24 hours and 4AM is 6 hours before 10AM. 24-6=18 10AM to noon is 2 hours. Noon to midnight is 12 hours. Midnight to 4AM is 4 hours. 2+12+4=18