How many weeks comprise a typical school year in America?
Primary and secondary schools In the United States, the academic year for most K–12 institutions typically consists of two 18-week semesters, each divided into two nine-week marking periods (or quarters), and typically constituting 180 instructional days. An instructional week is five instructional days, measured Monday–Friday at most public and private schools; Sunday–Thursday at some Jewish private schools; Saturday–Wednesday or Sunday–Thursday at Muslim private schools; and so on. Grades are usually reported per marking period, but major examinations are given per semester or per year. The traditional start date for the school year has been the day after Labor Day (the first Tuesday after the first Monday in September), but many schools now start in the last two weeks of August and some schools (especially private ones) may start as late as the end of September or the first week in October. There are also some schools, especially in the southern tier of the United States, that begin