10½ hours
There are 16 hours from 4 am to 8 pm. 4 am to 4 pm is 12 hours, then 4 pm to 8 pm is another 4 hours.
21 hours
8 hours
7 hours 30 minutes.
10½ hours
There are 16 hours from 4 am to 8 pm. 4 am to 4 pm is 12 hours, then 4 pm to 8 pm is another 4 hours.
There are 5 hours between 4 pm and 9 pm
2 hours
3 hours
21 hours
Two hours.
12 Hours.
nine and a half 16:00 - 06:30 = 9:30
Assuming 9:30am to 1:30pm or pm to am, 4 hours, if am to am or pm to pm, it is 20 hours.
53 hours
4 hours and 20 minutes.