Would this be the same 8 hours for everyone worldwide, would it be by the user's timezone, or would we get to choose our own 8 hours? This question was brought

Would this be the same 8 hours for everyone worldwide, would it be by the user's timezone, or would we get to choose our own 8 hours? This question was brought to you by memories of not being able to set the timezone of my tamagotchi and it subsequently dying because it was awake when I was asleep.