Relentless: Audiobook
Book 5 of the Lost Fleet series
According to The Books Insider's catalog data, the Relentless audiobook runs 9.7 hours unabridged, narrated by Christian Rummel (about 6.5 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 9.7 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 9.7 hours, it runs longer than 59% of the 13,269 Science Fiction audiobooks in our catalog.
Catching up on Lost Fleet
This is book 5. Books 1 to 4 run 39.6 hours before it; books 1 to 6 run 60.5 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | Dauntless | 9.9 hrs |
| 2 | Fearless | 9.8 hrs |
| 3 | Courageous | 9.7 hrs |
| 4 | Valiant | 10.1 hrs |
| 5 | Relentless | 9.7 hrs |
| 6 | Victorious | 11.2 hrs |
More narrated by Christian Rummel
Christian Rummel narrates 32 unabridged audiobooks in our catalog, 329 hours in all.
About as long, on the Science Fiction shelf
2,137 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
Relentless is book 5 of Jack Campbell's Lost Fleet series: a 9.7-hour unabridged recording, read by Christian Rummel, released June 21, 2022, on the Science Fiction shelf.
The listen at a glance
- Length
- 9.7 hrs
- Narrated by
- Christian Rummel
- Released
- June 21, 2022
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Science Fiction
- Series
- Lost Fleet #5
- ISBN
- 9781705071731
How to listen to Relentless 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 Relentless audiobook?
Relentless runs 9.7 hours unabridged. At 1.5× speed that drops to roughly 6.5 hours.
Is the Relentless audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates Relentless?
Relentless is narrated by Christian Rummel.