The next first day of school according to the most standard academic calendar is August 11, 2025. Today is August 29, 2025, so school has already started this year as of this date. If the question refers to a new academic year starting in the future or a different region, please specify the location or school district for a more precise answer. Otherwise, for the US in general, school has started 18 days ago based on the August 11 start date. If the question refers to the next school year start after this one, that would typically be around August 2026, but that date is not within the current year yet to count days toward.