The 10-minute rule is a homework guideline that recommends roughly 10 minutes of homework per night for each grade level, starting in first grade.
The math
Nightly minutes = grade level × 10
| Grade | Suggested time |
|---|---|
| 1st | 10 minutes |
| 3rd | 30 minutes |
| 5th | 50 minutes |
| 7th | 70 minutes |
| 9th | 90 minutes |
| 12th | 120 minutes |
Two kids in the same house, a 2nd grader and an 8th grader, would be looking at 20 and 80 minutes. A 30-minute classroom timer is a simple way for a 3rd grader to see what “enough” looks like.
Where it comes from
Duke University psychologist Harris Cooper, who led major reviews of homework research, recommends the rule as a general guideline, according to a Duke Today interview. For high school students he suggests an optimal range of about 90 minutes to 2½ hours a night. The National Education Association says many districts follow 10 minutes per grade level and calls it a good rule of thumb that teachers can adjust.
The National PTA’s position, by contrast, doesn’t set a formula. Its homework resolution asks for assignments that are grade- and age-appropriate in the time they require.
Its limits
The rule is a ceiling of sorts, not a target. It doesn’t account for reading speed, learning differences, or a student taking several AP classes at once. Time also isn’t quality: 20 focused minutes can beat an hour of distracted work. Our full guide to how much homework is too much covers the research behind these numbers, and the district homework policies survey shows how schools write the rule into policy. To track actual time spent, try the homework planner.