The Depths of Neptune: Imperium, Book 4: Audiobook
Book 4 of the Imperium series
According to The Books Insider's catalog data, The Depths of Neptune: Imperium, Book 4 runs 10 hours as an unabridged audiobook, narrated by Kevin Kemp (about 6.7 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 10 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 20 days |
| 1 hour / day | 10 days |
| 2 hours / day | 5 days |
| 1 hour / day at 1.5× | 7 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 10 hours, it runs longer than 61% of the 13,269 Science Fiction audiobooks in our catalog.
Catching up on Imperium
This is book 4. Books 1 to 3 run 36.4 hours before it; books 1 to 6 run 72.4 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | The Sword of Jupiter: Imperium, Book 1 | 17.2 hrs |
| 2 | The Trumpets of Mars: Imperium, Book 2 | 10.5 hrs |
| 3 | The Sands of Saturn: Imperium, Book 3 | 8.7 hrs |
| 4 | The Depths of Neptune: Imperium, Book 4 | 10 hrs |
| 5 | The Fires of Vulcan: Imperium, Book 5 | 11.6 hrs |
| 6 | The Triumph of Venus: Imperium, Book 6 | 14.4 hrs |
More narrated by Kevin Kemp
Kevin Kemp narrates 44 unabridged audiobooks in our catalog, 471 hours in all.
About as long, on the Science Fiction shelf
2,157 Science Fiction audiobooks in our catalog run within 10% of this length. The most popular on the store:
- And Then She Vanished
- Dark Matter
- Star Wars: The Old Republic - Legends: Revan
- Star Wars Legends: Darth Bane Trilogy: Rule of Two
- Star Wars Legends: Darth Bane Trilogy: Dynasty of Evil
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
The Depths of Neptune: Imperium, Book 4 is book 4 of Travis Starnes's Imperium series: a 10-hour unabridged recording, read by Kevin Kemp, released June 18, 2024, on the Science Fiction shelf.
The listen at a glance
- Length
- 10 hrs
- Narrated by
- Kevin Kemp
- Released
- June 18, 2024
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Science Fiction
- Series
- Imperium #4
- ISBN
- 9781039434752
How to listen to The Depths of Neptune: Imperium, Book 4 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 Depths of Neptune: Imperium, Book 4 as an audiobook?
The Depths of Neptune: Imperium, Book 4 runs 10 hours unabridged. At 1.5× speed that drops to roughly 6.7 hours.
Is The Depths of Neptune: Imperium, Book 4 free as an audiobook?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates The Depths of Neptune: Imperium, Book 4?
The Depths of Neptune: Imperium, Book 4 is narrated by Kevin Kemp.
Is The Depths of Neptune: Imperium, Book 4 worth listening to at 1.5× speed?
At 1.5× you'd finish in about 6.7 hours, saving 3.3 hours.