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Cover of When : the scientific secrets of perfect timing by Daniel H. Pink

Book · Non-fiction, memoir and self-help

When : the scientific secrets of perfect timing

by Daniel H. Pink

Page count, estimated reading time and reading quiz: everything to know before you start When : the scientific secrets of perfect timing, and the Vread challenge to get to the end.

Pages
234
Reading time
≈ 4 h 10 min
Checkpoints
7
Genre
Non-fiction
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Free on iPhone and Android.

How long does it take to read When : the scientific secrets of perfect timing?

At 234 pages, When : the scientific secrets of perfect timing is a medium-length book. Expect about 4 hours 10 minutes of reading to finish it, based on 250 words per page and an average reading speed of 230 words per minute. A fast reader will go quicker; a careful read (or reading in a second language) will take longer.

At 30 minutes a day, that is about 9 days of reading. At the median pace of Vread readers, 72 pages per reading day, it takes 4 reading days. For a book of this length (under 250 pages), Vread readers who finish it take a median of 4 days between the first and the last checkpoint (Vread Reading Barometer 2026).

Reading days to finish it
30 minutes a day9 days
Vread median pace (72 pp./day)4 days

Estimates; see the method at the bottom of the page.

Prove you read it

The Vread challenge: 7 checkpoints

  1. Checkpoint 1, page 33
  2. Checkpoint 2, page 67
  3. Checkpoint 3, page 100
  4. Checkpoint 4, page 134
  5. Checkpoint 5, page 167
  6. Checkpoint 6, page 201
  7. Checkpoint 7, page 234

In Vread, When : the scientific secrets of perfect timing is split into 7 checkpoints, one every 33 pages or so. At each checkpoint, a question covers the passage you have just read: a correct answer validates the step, and your progress moves forward like a training plan.

The challenge: validate all 7 checkpoints through to the last page. No giant quiz at the end, no summary to copy out: short questions along the way that prove the book was actually read. It also works as a reading quiz to check your understanding before a test.

Also available in French on Vread.

Illustrative example

Checkpoint 1/7pp. 1–33

What a checkpoint looks like

A short, precise question about the pages you have just read: a character, a place, a choice.

The answer is in the text: reply in the app.

This is not a question from When : the scientific secrets of perfect timing: to avoid spoilers, the real questions stay in the app.

Answer in the app, one checkpoint at a time.

Summary, quiz, reviews: frequently asked questions

How many pages is When : the scientific secrets of perfect timing?
The edition listed on Vread has 234 pages. The exact count varies by edition (paperback, hardback, ebook).
How long does it take to read When : the scientific secrets of perfect timing?
About 4 hours 10 minutes of reading, or 9 days at 30 minutes a day.
Is there a quiz on When : the scientific secrets of perfect timing?
Yes: the Vread app has 7 reading questions on When : the scientific secrets of perfect timing, one per checkpoint, unlocked as you read.
Where can I find a summary of When : the scientific secrets of perfect timing?
Vread does not publish summaries: the app supports reading the book itself, part by part. Checkpoint questions cover what you have just read, which makes them a good way to check you did not miss anything.

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Read When : the scientific secrets of perfect timing with Vread

Add the book to your library, read at your own pace in whatever format you use, and validate each checkpoint. Vread is free on iPhone and Android.

Take the challenge

Written by Vread from its catalogue data (page count of the listed edition, checkpoints, ratings aggregated from 10 ratings). No summary or publisher text is reproduced. Reading times are estimates; see the method in the Vread Reading Barometer (in French).