United States:
* Elementary school: 6-8 hours
* Middle school: 7-8 hours
* High school: 7-8 hours
United Kingdom:
* Primary school: 6-7 hours
* Secondary school: 7-8 hours
India:
* Primary school: 3-5 hours
* Secondary school: 6-7 hours
Australia:
* Primary school: 6-7 hours
* Secondary school: 7-8 hours
Germany:
* Primary school: 4-6 hours
* Secondary school: 7-8 hours
Please note that these are just rough averages and the actual school day length can vary within each country and region. Additionally, some schools may have extended day programs that offer additional hours of instruction or extracurricular activities.