That depends on where exactly you are, and on the season.
24 hours
in the area where trees are not there
12 hours of sunlight and 12 hours of darkness
The number of hours of darkness in winter varies by location. For example, in regions closer to the poles, such as parts of Alaska or Norway, there can be continuous darkness for weeks. In more temperate areas, like much of the continental United States, winter days can have around 9 to 10 hours of darkness. Generally, the further north you are, the longer the periods of darkness during winter months.
If you mean day by day 24.
There is approximately 7 to 8 hours of daylight in areas such as Stockholm Switzerland in the winter. Areas like Kiruna Switzerland have 24 hours of darkness through January.
During winter, some locations experience more hours of darkness because the Earth's axis is tilted away from the sun, causing the sun's rays to hit the Northern Hemisphere at a more oblique angle. This results in shorter days and longer nights, leading to more hours of darkness.
336 hours are in a winter break.
The amount of hours that happen at night during the Winter can vary greatly by location on Earth. For instance, near the North Pole, it can be dark the entire winter.
12 hours of daylight. 12 hours of darkness.
Depends on what time of year it is
It depends on where you are and what season it is. If you are at the equator then there is 12 hours of daylight and 12 hours of night. If you are above the arctic circle then during the winter there is 24 hours of darkness each day, this will occur on Dec. 21st. If you are further above the arctic circle the darkness can last for months. During the summer there will be 24 hours of daylight on June 21st, and again this can last for months if you are very far north. The same is true for the South pole as well.