You did not spend enough time your MC classroom teaching.
Game does not end until you get all quest to the point that they say "Coming Soon" for the staff quest, the number of days do not mater for this game its the quest that do.
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It seems you must also get the main guest done also but part of them are or seems to be broken on the "skip to day 2" option.
The main quest seems to have something broken in them though but you can complete it to a point.
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Old saves seems to not work so starting a new game or using the skip to day 2 option is what is needed.