Five hours.
9 hours
6 hours
13 hours
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
6.5 hours (6 hours 30 minutes) between 10am and 4:30pm
16 = 11 + 5 1pm to midnight is 11 hours (12 - 11 = 1) then midnight to 5am is 5 hours
5 hours
3 hours
8 hours
12 hours