Assuming we are talking about the period starting from 4 am in the morning and ending at 5 pm the same day, it would be 13 hours - 8 hours from 4 am until noon and then 5 more hours until 5 pm:
8 + 5 = 13
4am
4am
10 hours
48 hours.
72 hours
From 6am to 5pm is 11 hours.
11am to 12 is 1 hour 12 to 5pm is 5 hours → 11am to 5pm is 1 + 5 = 6 hours
2 hours
13 hours
8.5 hours
9 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