Book · Non-fiction, memoir and self-help
21 lessons for the 21st century
by Yuval Noah Harari, Ernest Riera Arbussà
Page count, estimated reading time and reading quiz: everything to know before you start 21 lessons for the 21st century, and the Vread challenge to get to the end.
- Pages
- 372
- Reading time
- ≈ 6 h 40 min
- Checkpoints
- 10
- Genre
- Non-fiction
Free on iPhone and Android.
How long does it take to read 21 lessons for the 21st century?
At 372 pages, 21 lessons for the 21st century is a fairly long book. Expect about 6 hours 40 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 14 days of reading. At the median pace of Vread readers, 72 pages per reading day, it takes 6 reading days. For a book of this length (250 to 399 pages), Vread readers who finish it take a median of 4.7 days between the first and the last checkpoint (Vread Reading Barometer 2026).
- 30 minutes a day14 days
- Vread median pace (72 pp./day)6 days
Estimates; see the method at the bottom of the page.
Prove you read it
The Vread challenge: 10 checkpoints
- Checkpoint 1, page 37
- Checkpoint 2, page 74
- Checkpoint 3, page 112
- Checkpoint 4, page 149
- Checkpoint 5, page 186
- Checkpoint 6, page 223
- Checkpoint 7, page 260
- Checkpoint 8, page 298
- Checkpoint 9, page 335
- Checkpoint 10, page 372
In Vread, 21 lessons for the 21st century is split into 10 checkpoints, one every 37 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 10 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
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 21 lessons for the 21st century: 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 21 lessons for the 21st century?
How long does it take to read 21 lessons for the 21st century?
Is there a quiz on 21 lessons for the 21st century?
Where can I find a summary of 21 lessons for the 21st century?
Similar books: non-fiction, memoir and self-help
Read 21 lessons for the 21st century 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