The academic year is a month old by the end of September and running at full pace. There is no scheduled break in it: the first pause after the August start is the winter holiday in the second half of December, which puts September 2029 inside the longest continuous teaching block of the three terms.
September closes the third quarter of 2029 on the 30th, and it does so with the working year back at full staffing after the summer. Decisions held over from July and August land inside the same three weeks, which is why September feels busier than the quarter it belongs to has any right to.
September 2029 runs to 30 days and closes the third quarter of a year of 365. One quarter remains, and it carries the entire outdoor season, the national holiday at the start of December and the school winter break at the end of it.