Hampton Elementary School parents have asked the Baltimore County Board of Education to relieve their overcrowded classrooms for months. Teachers host class sizes well beyond state-recommended limits. The gymnasium cannot hold all students for assemblies. Lunch now spans three hours to fit each student into the cafeteria. By Baltimore County school system’s count, the Timonium school reached 112% capacity in September. Hampton Elementary parents say the current percentage is even higher. Across the school system, nearly one-third of schools are at or over capacity, according to August data.