Game days are 70 minutes long. The fact that a game day is so short when the graphics are so good is actually harmful to our health as human beings, because of a little thing called "circadian rhythm."
Humans are HARD-WIRED to respond to light and dark (sunrise and sunset). It tells us when to wake and sleep by releasing hormones such as melatonin. Ever since the advent of modern technology (electricity, indoor lighting, etc.) humans have been screwing up their natural circadian rhythms, eroding their health in subtle ways that have all sorts of health implications.
Looking at a phone screen late at night is really bad for you. The ideal situation would be to STOP using ALL screens at least 1 hour before bed. But that's unrealistic. So virtually all modern phones now have a feature that shifts the color to a reddish tint as it gets later in the evening. If you are not already using this feature, you should enable it! Combined with dimming the brightness late at night around the entire house, it is the next best thing you can do for your ability to sleep well and feel good on a daily basis.
Why the reddish tint? A study demonstrated that blue-colored light tells us to "wake up!" because it looks like the daytime sky, whereas reddish colors tell us to "go to sleep" because it looks like the sunset. Most screens actually have a lot of blue light in them, even when the screen looks white. In addition to automated blue/red tint control, many apps/OS's now have a dark mode theme, which is less hard on the eyes at night.
When it's 10pm in real life but you see a blue sunrise in game, it messes up your circadian rhythm and creates poor sleep. If you DON'T think this is affecting you, you're probably already accustomed to feeling crappy all the time, because you ignore your circadian rhythm. Once I started slowly dimming the light level each evening as it got progressively later, I started sleeping SO MUCH better. Give it a try; you will see I'm right.
Square Enix, PLEASE add a UI option that would allow players to change the flow of time in game to match their local time. A day in game should last 24 hours in my timezone. It should be dark in game when it is dark in my timezone, and it should be bright in game when it is bright in my timezone. Or close enough.
I understand there are certain quests or mobs with rare drops that only spawn at certain times. Which is why this should be a config option. If we force this change on players, some may never be able to play at night (or day), and can therefore never play at the times needed. Making it a config option solves this problem.
But what about the potential to abuse this setting? Couldn't players keep toggling it to get all kinds of rare drops? Solution: limit the number of times in 1 earth day that a player can change this setting, e.g. 1x per earth day.
Even if nobody else WANTS this change, it's probably only because they have no idea how badly this is already affecting them.