Schools and Staffing Survey (SASS)

A quadrennial survey of principals conducted by the National Center on Education Statistics. In the latest analysis we’ve produced in partnership with our good friend, Professor Tammy Kolbe of the University of Vermont, we found on these two basic questions that, among non-charter schools, the length of the school day has increased slightly over the last few years to 6.8 daily hours—and a bit more among charters—while the duration of the school year has remained consistent at 179 days.