Yes, you must enter your score between 7PM the day of and midnight the next day for each day of game play. That gives you 29 hours to enter your score for each day.
We recommend entering your score each day, soon after 7pm if possible, so that your activities, experiences, and day's thoughts are still fresh in your mind. Your reflections on the day will be more meaningful if they come from contemporaneous thoughts rather than recollections later on.
If you missed a day of scoring, you can use a mulligan to reopen that day's scoring after the regular window has closed.