Most kids in the U.S. go to school for about 13 years (from around age 5 in kindergarten through 12th grade, graduating at about 18).

How long is school in years?

  • In many countries, “school” usually means primary + secondary education.
  • Across developed countries, primary school is about 6 years on average, and lower secondary is about 3 more years, with at least 1–2 years of upper secondary often compulsory.
  • That means compulsory schooling is often around 9–11 years, and total schooling (if you stay through the end of high school) is often 12–13 years.
  • In the U.S., a typical path is:
    • Kindergarten (age ~5)
    • Grades 1–5 or 1–6 (elementary)
    • Grades 6–8 or 7–8 (middle)
    • Grades 9–12 (high school)
      → Total: usually 13 school years (K–12).

How long is a school year?

  • In the U.S., the most common requirement is about 180 instructional days per year.
  • Some places count hours instead of days , but it usually works out to roughly the same total time over the year.
  • Other countries vary, but the total classroom time per year is broadly similar in most OECD countries.

How long is a school day?

  • A “typical” school day in many U.S. public schools is roughly 6–7 hours of on-campus time (for example, about 8:00 a.m. to 3:00 p.m.), though this varies by state and district.
  • Different grades may have different required hours per year (younger students often have slightly fewer hours, older students more).
  • Around the world, primary and lower-secondary students generally spend several hundred to a bit over 1,000 hours per year in class, depending on the country and grade level.

Put simply

If you’re asking “how long is school” in general:

  • In years: usually about 12–13 years from the start of primary school to the end of high school.
  • In a year: roughly 180 days of school in places like the U.S.
  • In a day: usually around 6–7 hours on campus for full-time K–12 students.

Information gathered from public forums or data available on the internet and portrayed here.