Section 1704 - Length of school year, and expenditure of funds1. No board of education or community board in the city school district of the city of New York, except as otherwise provided by law, shall authorize or permit the expenditure of funds under its control at a rate which will exhaust the amount appropriated prior to the conclusion of the period or the completion of the purpose for which such funds were appropriated.2. Except as otherwise provided by law, no board of education or community board in the city school district of the city of New York shall provide for a school year consisting of fewer than one hundred eighty days of school.