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Cover of Den of Vipers by K.A Knight

Book · Other fiction

Den of Vipers

by K.A Knight

Page count, estimated reading time and reading quiz: everything to know before you start Den of Vipers, and the Vread challenge to get to the end.

Pages
400
Reading time
≈ 7 h 20 min
Checkpoints
20
Genre
Fiction
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Free on iPhone and Android.

How long does it take to read Den of Vipers?

At 400 pages, Den of Vipers is a fairly long book. Expect about 7 hours 20 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 15 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 (400 to 599 pages), Vread readers who finish it take a median of 5.3 days between the first and the last checkpoint (Vread Reading Barometer 2026).

Reading days to finish it
30 minutes a day15 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: 20 checkpoints

  1. Checkpoint 1, page 20
  2. Checkpoint 2, page 40
  3. Checkpoint 3, page 60
  4. Checkpoint 4, page 80
  5. Checkpoint 5, page 100
  6. Checkpoint 6, page 120
  7. Checkpoint 7, page 140
  8. Checkpoint 8, page 160
  9. Checkpoint 9, page 180
  10. Checkpoint 10, page 200
  11. Checkpoint 11, page 220
  12. Checkpoint 12, page 240
  13. Checkpoint 13, page 260
  14. Checkpoint 14, page 280
  15. Checkpoint 15, page 300
  16. Checkpoint 16, page 320
  17. Checkpoint 17, page 340
  18. Checkpoint 18, page 360
  19. Checkpoint 19, page 380
  20. Checkpoint 20, page 400

In Vread, Den of Vipers is split into 20 checkpoints, one every 20 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 20 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 1/20pp. 1–20

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 Den of Vipers: 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 Den of Vipers?
The edition listed on Vread has 400 pages. The exact count varies by edition (paperback, hardback, ebook).
How long does it take to read Den of Vipers?
About 7 hours 20 minutes of reading, or 15 days at 30 minutes a day.
Is there a quiz on Den of Vipers?
Yes: the Vread app has 20 reading questions on Den of Vipers, one per checkpoint, unlocked as you read.
Where can I find a summary of Den of Vipers?
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.

Read Den of Vipers 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).