Unstable Prototypes: Audiobook
Book 2 of the Big Sigma series
According to The Books Insider's catalog data, the Unstable Prototypes audiobook runs 18.3 hours unabridged, narrated by John Forbes (about 12.2 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 18.3 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 37 days |
| 1 hour / day | 19 days |
| 2 hours / day | 10 days |
| 1 hour / day at 1.5× | 13 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 18.3 hours, it runs longer than 94% of the 6,730 Action & Adventure (Fiction) audiobooks in our catalog.
Catching up on Big Sigma
This is book 2. Book 1 runs 10.7 hours before it; books 1 to 4 run 65.7 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | Bypass Gemini | 10.7 hrs |
| 2 | Unstable Prototypes | 18.3 hrs |
| 3 | Artificial Evolution | 18.4 hrs |
| 4 | Temporal Contingency | 18.3 hrs |
More narrated by John Forbes
John Forbes narrates 6 unabridged audiobooks in our catalog, 80 hours in all.
About as long, on the Action & Adventure (Fiction) shelf
235 Action & Adventure (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
Unstable Prototypes is book 2 of Joseph Lallo's Big Sigma series: a 18.3-hour unabridged recording, read by John Forbes, released November 15, 2016, on the Action & Adventure (Fiction) shelf.
The listen at a glance
- Length
- 18.3 hrs
- Narrated by
- John Forbes
- Released
- November 15, 2016
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Action & Adventure (Fiction)
- Series
- Big Sigma #2
- ISBN
- 9781614538783
How to listen to Unstable Prototypes 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 the Unstable Prototypes audiobook?
Unstable Prototypes runs 18.3 hours unabridged. At 1.5× speed that drops to roughly 12.2 hours.
Is the Unstable Prototypes audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates Unstable Prototypes?
Unstable Prototypes is narrated by John Forbes.
Is Unstable Prototypes worth listening to at 1.5× speed?
At 1.5× you'd finish in about 12.2 hours, saving 6.1 hours.