I need a planet where the day cycle is short, in particular 16 hours. I read https://worldbuilding.stackexchange.com/questions/575/what-determines-the-length-of-a-day-on-a-planet and https://worldbuilding.stackexchange.com/questions/176/is-it-physically-possible-for-a-planet-to-have-seasons-of-different-lengths?rq=1 that establish the environment. Also https://worldbuilding.stackexchange.com/questions/19728/can-i-significantly-shorten-the-days-on-a-planet-that-can-support-human-life and https://worldbuilding.stackexchange.com/questions/21521/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 changes from life on Earth as we know it, because of the shorter day-cycle? Or, as can be considered equivalent, what would the interesting effects be on Earth itself, should somehow the day-cycle be shortened thus?

This is my very first question in worldbuilding, so feel free to assist me in the proper way of asking, as well.