„In lower secondary schools, on average, Finnish teachers teach about 600 hours, i. e. 800 lessons of 45 minutes, annually. […] Lower teaching hours provide teachers more opportunities to engage in school improvement, curriculum planning, and personal professional development during their working hours.“
Dr. Pasi Sahlberg, „Paradoxes of educational improvement: The Finnish experience“. In: „Scottish Educational Review“, 43 (1), 2011, S. 14