The reading log has gone three days without a signature. It asks for twenty minutes a day, with a box and a line for a parent to initial, and this week produced six minutes on Tuesday and nothing since.
It is worth knowing where that number came from before feeling bad about it.
Twenty minutes is the 90th percentile of a study from 1988: the mark set by the top ten percent of readers in a group of 155 fifth graders. Half of those children read for 4.6 minutes a day. Here is the full table, what reading time does buy, and what it leaves alone.
This is reason 6 of ten reasons someone won’t read, and the only one measured with a clock.
Where did twenty minutes a day come from?
From a study by Richard Anderson, Paul Wilson and Linda Fielding. One hundred and fifty-five fifth graders wrote down every day, for weeks, how they spent their time outside school. Those diaries produced minutes of reading by percentile, and from there words per year were extrapolated.
Anne Cunningham and Keith Stanovich reproduced the table in American Educator in 1998:
| Percentile | Minutes of reading per day | Words per year |
|---|---|---|
| 98 | 65.0 | 4,358,000 |
| 90 | 21.1 | 1,823,000 |
| 80 | 14.2 | 1,146,000 |
| 70 | 9.6 | 622,000 |
| 60 | 6.5 | 432,000 |
| 50 | 4.6 | 282,000 |
| 40 | 3.2 | 200,000 |
Source: Cunningham and Stanovich, American Educator, 1998, with data from Anderson, Wilson and Fielding (1988).
Look at the two bold rows. The line on the reading log is the 90th percentile row — the heaviest readers in that group. The middle row, the one describing half the children, says four and a half minutes.
And there is one more line, written by the authors themselves on the same page of the original study: “the estimates of words read per year shown in Table 3 are unstable since the error in the constituent measures is magnified” (Anderson, Wilson and Fielding, 1988). They put the warning in. The classroom posters left it out.
What does reading time actually buy?
This deserves saying with equal clarity: reading a lot does do something, and it is measured.
Cunningham and Stanovich asked the hard question — whether heavy readers come out ahead only because they were already more able — and settled it statistically. Their conclusion: “even when performance is statistically equated for reading comprehension and general ability, reading volume is still a very powerful predictor of vocabulary and knowledge differences.” And the punchline: reading volume “is actually a potentially separable, independent source of cognitive differences.”
In plain terms: people who read more know more words and more about the world, and that happens because of the reading, beyond how bright they were to begin with.
Where it shows up most, according to the second finding below: in recognising words fluently and in wanting to read. Which are exactly the two things missing from the household with the unsigned log.
And what doesn’t it buy in three months?
Here is the part almost no article on the subject includes.
In 2024 a meta-analysis of in-school independent reading was published: 47 studies, 7,493 students from kindergarten to grade 10, conducted between 1970 and 2020. It measured three things separately, and separately is how they have to be read:
| What was measured | Effect (Hedges’ g) | How to read it |
|---|---|---|
| Word recognition | 0.21 | The largest of the three. Fluency, decoding, word identification |
| Attitude towards reading | 0.18 | They like reading more afterwards |
| Comprehension | −0.014 | Essentially zero |
| Overall | 0.08 | Small, and statistically significant |
Source: Bus, Shang and Roskos, AERA Open, 2024.
The three numbers travel together, always. People defending free reading quote the 0.21 and people attacking it quote the −0.014, and either quote alone misleads.
And the authors explain the comprehension zero without dismissing it: the average duration of the programmes analysed was twenty-five minutes a day over a median of three months, which “may not have allowed enough time for extensive reading, which is crucial for improving the complex knowledge unique to reading comprehension.”
What the finding does support, in their words: building authentic, unrestricted reading into the school day “leads to students perceiving reading as more exciting and enjoyable.”
So how much is enough?
The number this house defends is this one: the amount that holds up every week.
What the three sources above say together:
- Twenty minutes describes the top tenth, and it was offered as a portrait, never as a requirement.
- Accumulated volume matters, and it accumulates in years, not in terms.
- Three months of twenty-five minutes move fluency and enjoyment, and comprehension asks for a longer run.
Out of which comes the practical advice, in two sentences. Five minutes that happen beat twenty that don’t, because the sum is counted in years. And the way to make them happen is a book that fits and that they chose themselves: here are three things you can measure with the book in your hands.
One more thing about what counts. If the time goes to graphic novels, it counts: what they read there carries more rare words per thousand than a children’s novel.
What about the reading log?
Sign it with what actually happened.
The log is the school’s tool for knowing what goes on at home, and it works better when it tells the truth. Six minutes recorded as six minutes gives that teacher useful information; twenty invented minutes give her noise, and give you a week of feeling bad.
And if the conversation with the school is available, the number above can go into it. The table is published and freely available.
Where to start
This week, instead of chasing twenty minutes, count the days. Five days with five minutes beat one Sunday with half an hour, because what is being built is a habit, and habits are measured in days.
And if reading time still refuses to arrive, time may not be the cause: there are nine more reasons in the ten, ordered from the cheapest to rule out to the slowest to change.
Where these numbers come from
- Cunningham, Anne E. and Stanovich, Keith E., “What Reading Does for the Mind,” American Educator, 1998. Table 3 carries data from Anderson, Wilson and Fielding (1988). Source
- Anderson, Wilson and Fielding, “Growth in Reading and How Children Spend Their Time Outside of School,” Reading Research Quarterly 23(3), 1988. Source
- Bus, Adriana G., Shang, Yi and Roskos, Kathleen, “Building a Stronger Case for Independent Reading at School,” AERA Open 10(1), 2024. Source
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