An Equation with One Unknown: Audiobook
Book 2 of the Invasion series
According to The Books Insider's catalog data, An Equation with One Unknown runs 14.1 hours as an unabridged audiobook, narrated by Bj Harrison (about 9.4 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 14.1 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 29 days |
| 1 hour / day | 15 days |
| 2 hours / day | 8 days |
| 1 hour / day at 1.5× | 10 days |
You'll finish in – by –
Part of The Audiobook Finish-Time Calculator: the same instrument for any audiobook we measure.
What our data says
- At 14.1 hours, it runs longer than 85% of the 13,269 Science Fiction audiobooks in our catalog.
Catching up on Invasion
This is book 2. Book 1 runs 13.3 hours before it; books 1 to 3 run 37 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | A Second Chance | 13.3 hrs |
| 2 | An Equation with One Unknown | 14.1 hrs |
| 3 | The Portals of Altameda | 9.6 hrs |
More narrated by Bj Harrison
Bj Harrison narrates 85 unabridged audiobooks in our catalog, 1,008 hours in all.
About as long, on the Science Fiction shelf
1,355 Science Fiction audiobooks in our catalog run within 10% of this length. The most popular on the store:
Computed from 409,794 English-language unabridged audiobooks in The Books Insider catalog (store data read November 3, 2026). Lengths are the store's own running times. Methodology.
About this listen
An Equation with One Unknown is book 2 of Vasily Mahanenko's Invasion series: a 14.1-hour unabridged recording, read by Bj Harrison, released October 27, 2020, on the Science Fiction shelf.
The listen at a glance
- Length
- 14.1 hrs
- Narrated by
- Bj Harrison
- Released
- October 27, 2020
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Science Fiction
- Series
- Invasion #2
- ISBN
- 9781705256947
How to listen to An Equation with One Unknown free
New members at audiobooks.com get three free audiobooks with the trial.
Separately, the store's catalog carries more than 10,000 audiobooks that are always free to stream.
Start listening freeQuestions listeners ask
How long is An Equation with One Unknown as an audiobook?
An Equation with One Unknown runs 14.1 hours unabridged. At 1.5× speed that drops to roughly 9.4 hours.
Is An Equation with One Unknown free as an audiobook?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates An Equation with One Unknown?
An Equation with One Unknown is narrated by Bj Harrison.
Is An Equation with One Unknown worth listening to at 1.5× speed?
At 1.5× you'd finish in about 9.4 hours, saving 4.7 hours.