I need a planet where the day cycle is short, in particular 16 hours. I read What determines the length of a day on a planet? and Is it physically possible for a planet to have seasons of different lengths? that establish the environment. Also Can I significantly shorten the days on a planet that can support human life? and How would humans be affected by a 12-hour day? that deal with the effect on humans and their biology. I got lots of my initial questions covered, and it seems that such a planet is possible, probable and viable to sustain human colonies. My question then boils to the anthropological and social level.
What would be the most significant societal changes from life on Earth as we know it, because of the shorter day-cycle?
This is my very first question in worldbuilding, so feel free to assist me in the proper way of asking, as well.