How Much Homework by Grade: Where the 10-Minute Rule Comes From

By Laura Lurns · Reviewed by Philip Weaver · Last reviewed 2026-09-28

Where does the 10-minute rule come from?

You may have heard the 10-minute rule. Ten minutes of homework a night for each grade.

The numbers come from a guide for parents. The National PTA and the National Education Association (NEA) wrote it in 2000. Harris Cooper, a homework researcher, quoted it in 2001.

Here is what the guide says: "Most educators agree that for children in grades K–2, homework is most effective when it does not exceed 10–20 minutes each day; older children, in grades 3–6, can handle 30–60 minutes a day."

For grades K–2, it says no more than 10 to 20 minutes a day. It says grades 3–6 can handle 30 to 60 minutes a day. The part Cooper quotes says nothing about grades 7 to 12.

Cooper writes that educators "often refer to this as the Ten Minute Rule." They mean ten minutes for each grade, each night.

Is the 10-minute rule based on research?

Not directly. In the part Cooper quotes, the guide's reason is "Most educators agree." That is a shared view among educators. It is not a measurement.

Nor does the formula come from the part Cooper quotes. Ten times kindergarten is zero, yet the guide starts it at 10 minutes.

You may read that Cooper came up with the rule. His own article says otherwise. It credits the parent guide for the numbers. It credits educators for the name.

Cooper also combined dozens of studies. He wrote that this work does "support these recommendations." So his work does not argue with the ranges. It did not set them.

Does homework help at every grade?

Cooper compared the amount of homework with school results. The link changed with grade.

• In grades 3 to 5, the link was "nearly zero."
• In grades 6 to 9, it was "somewhat higher."
• In high school, it was highest.

For elementary students, he wrote this. Homework's effect on school results is "trivial, if it exists at all."

Cooper adds a warning. A link is not proof of cause. In his words: "Of course, correlation does not mean causation; it is just as likely that high achievement causes students to do more homework as vice versa."

Cooper, Robinson and Patall wrote a later review in 2006. We have read only its summary. It says the link was stronger in grades 7–12 than in K–6. It also says every study in it had design flaws.

How much homework for middle school and high school?

Here Cooper's review does show a shape. In junior high, results rose with more homework. They rose until it reached one to two hours a night. Then results leveled off.

In high school, results kept rising with more homework.

Again, this is a link, not proof of cause.

For younger students, more homework did not go with better results. So his review gives no amount to aim for below junior high.

What if homework takes far longer than the teacher intended?

The ranges are a rough guide. They are not a test your child has to pass. What we suggest to the families we work with:

Tell the teacher. Say how long it took and where your child got stuck.

Ask what the work is for. Then ask whether it can be sized to where your child is now.

Agree on a stop time. When it comes, stop. Send a note saying how far your child got.

Cut the first piece small. Start with a piece your child can finish.

Check the work itself. Some children cannot yet read the worksheet easily. That can look like not wanting to do it.

Protect sleep. Homework should not push bedtime back.

We hold no measurement of what these steps do to homework time or school results.

Sometimes homework takes far longer than the teacher intended, night after night. That is a reason to get someone else to look at it. Start with the teacher.