201/2 hours exactly.
3.416666 repeating hours 3 hours, 25 minutes
14 hours, and 30 minutes
It is 4 hours and 15 minutes.
6 hours and 30 minutes
8 hours.
From 9:55 to 12:30 is 2 hours and 35 minutes.
3.5 hours.
14 hours 12 minutes.
Four
4
It is 4 hours.