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The first 20 minutes, they do silent studying/reading or homeroom activities. The first period starts at 8:30-8:40. There are about 6 periods a day, there may be 5 on a special schedule day. Elementary school classes are 45 minutes long, junior high classes 50 minutes long.
There are four classes in the morning, then there is a break for lunch. Lunch is prepared and served in the classrooms, by the students. Lunch break is separate from eating time and it is about 45 minutes. Usually, after lunch, there are 10-20 minutes of cleaning. Sometimes it is at the end of the day instead or may be skipped because of homeroom activities.
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Older Elementary school kids leave school around 4 PM. At Junior High, kids who aren't in any clubs can leave school at around 4:30 PM. Kids with club activities have a short break and then practice until around 6 pm. Junior High kids are often at school more than 10 hours a day.
So I hope you like my post about 'A Day in a Life in Japan'. Comment down below if you learnt something about time at school in Japan. Have a cool day!! Bye!!