In Japan, when children start school at age 6, students are asked to buy a blank notebook in year 5 for self-study. Every night they are expected to fill in two pages (sometimes three, depending on how strict the form tutor is) with notes or practice questions on any of their subjects. This isn’t their only homework either; other teachers might set them worksheets, or pages to complete from their workbook.
My half-Japanese cousins all went through the Japanese school system, and managed to get away with less work than most due to their ability to write a whole load of English song lyrics that their teachers couldn’t understand in their self-study books. Nevertheless, when they came over to visit us every summer they’d have to pay for extra luggage allowance just to accommodate all their school books.