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15-year-old pupils in Denmark and Austria ...

„15-year-old pupils in Denmark receive four hours of instruction per week in mathematics and 4.7 hours in language, while pupils of the same age in Austria receive only 2.7 hours of weekly classroom lessons in mathematics and 2.4 hours in language.“

Univ.-Prof. Dr. Victor Lavy, „Do Differences in Schools' Instruction Time Explain International Achievement Gaps?“ in „The Economic Journal“ 125 (November 2015), S. 397