Sons of the Forest has several different lengths of day/night cycles to choose from. If you're trying to decide which of these to play, you might be wondering how long each type of day is.
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When you create a new game, you can choose your settings in the main menu. There are different difficulty levels, but there is also something you can customize. One of the settings is the day length, and you can choose from four different settings: Short, Standard, Long, and Realistic. Below are the lengths of each day in each setting in real time.
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Daylight lasts about two-thirds of the day, with night the last third. This means that daylight lasts about 26 minutes in Short, about 53 minutes in Default, two hours and 40 minutes in Long, and a full day in Realistic. While you may stay up all night, you'll likely be sleeping through most nights to fill your sleep meter, so your day length will likely be closer to the times in this paragraph. You can check the time in-game at any time by pressing M and opening the map.