It depends on where you are on the earth and what day of the year it is.
12 hours
about 10 hours
There are 4.9625 hours in one night on Jupiter.
24 hours.
24 hours.
8 to 10 hours
4 hours
10 hours
It's usually three hours on a school night.
24
12 hours of sunlight and 12 hours of darkness
48 hours
Less than 8 hours.