The two-days school festival may be happening on the last days of October or something like that and at the rate we are going it may be a whole year to tell what happens on a single day of that festival, so roughly two years for that two-day festival. After the festival we have got a lot of important moments, like Christmas, New Year's Eve, New Year day, the admision exams, the presentation of the result of the admision exams, the planning and preparation of the graduation ceremony and then the graduation ceremony on roughly March 20, so if they are going to take two years to tell the happenings of a two-day arc, then imagine how many years they will take to tell all those important events with their respective arcs hapenning on those nearly five months, so yeah, at the rate we are going it would not surpise me if on some way this manga lasts until the Summer of 2031, its 20th anniversary, with that end being on the end of the graduation ceremony day.