Reading time
How long does it take to read Mostly Harmless?
Mostly Harmless by Douglas Adams is about 259 pages, so it takes about 4½ hours at an average 238 words per minute — about 10 days at 30 minutes a day.
At an average reading speed
4 h 32 min
Mostly Harmless · Douglas Adams · first published 1992
- Pages
- 259
- 30 min a day
- 10 days
By reading speed
| Unhurried reader · 180 wpm | 6 h |
| Average adult · 238 wpm | 4 h 32 min |
| Quick reader · 300 wpm | 3 h 36 min |
| Very fast reader · 400 wpm | 2 h 42 min |
By daily habit
Your reading speed
| 15 minutes a day | 19 days |
| 30 minutes a day | 10 days |
| 45 minutes a day | 7 days |
| 60 minutes a day | 5 days |
Page count: median of 53 editions on Open Library. Times assume about 250 words per page. How we calculate.
#5 in The Hitchhiker's Guide to the Galaxy
Next in the series: And Another Thing... (2009, 336 pages)
Your real reading speed
Time your sessions and Bookwisp learns how fast you actually read.
Start the timer when you open the book; it keeps running on your Lock Screen. Stop it, note your page, and your weekly minutes and streak update.

Mostly Harmless: reading time questions
- How many pages is Mostly Harmless?
- Mostly Harmless is about 259 pages. That is the median across the 53 editions listed on Open Library; hardcover, paperback and large-print editions differ.
- How long does it take to read Mostly Harmless?
- About 4 h 32 min at 238 words per minute, the average silent reading speed for adults. A quick reader at 300 words per minute needs about 3 h 36 min.
- How many days to read Mostly Harmless at 30 minutes a day?
- About 10 days. At 15 minutes a day it takes about 19 days, and at an hour a day about 5 days.
- What number is Mostly Harmless in the The Hitchhiker's Guide to the Galaxy series?
- Mostly Harmless is book 5 in The Hitchhiker's Guide to the Galaxy by Douglas Adams.
Books of about the same length
- The GunslingerStephen King · 256 pages · 4 h 29 min
- The Murder of Roger AckroydAgatha Christie · 256 pages · 4 h 29 min
- A Tale of Two KittiesDav Pilkey · 256 pages · 4 h 29 min
- The Memoirs of Sherlock HolmesArthur Conan Doyle · 259 pages · 4 h 32 min
- Dog Man and Cat KidDav Pilkey · 256 pages · 4 h 29 min
- The Mystery of the Blue TrainAgatha Christie · 257 pages · 4 h 30 min