24 hours
12 hours.
4to 9pm is how much hours
Between 10am and 9pm, there are 11 hours.
There are 17 hours between 9pm and 2pm the following day.
7 hours
7 hours.
7 hours.
There are 4*(1 + 6*k) hours where k is an integer.
Hours are between 4pm and 9pm is 5 hours, 9 pm -4 pm
10 hours
Twelve hours