Colonel: Audiobook
Book 7 of the Federation Marine series
According to The Books Insider's catalog data, the Colonel audiobook runs 7.2 hours unabridged, narrated by Sean Pratt (about 4.8 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 7.2 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 15 days |
| 1 hour / day | 8 days |
| 2 hours / day | 4 days |
| 1 hour / day at 1.5× | 5 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 7.2 hours, it is shorter than 63% of the 13,269 Science Fiction audiobooks in our catalog.
Catching up on Federation Marine
This is book 7. Books 1 to 6 run 45.5 hours before it; books 1 to 8 run 61.1 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | Recruit | 7.4 hrs |
| 2 | Sergeant | 8.8 hrs |
| 3 | Lieutenant | 7.6 hrs |
| 4 | Captain | 7.6 hrs |
| 5 | Major | 7.2 hrs |
| 6 | Lieutenant Colonel | 7 hrs |
| 7 | Colonel | 7.2 hrs |
| 8 | Commandant | 8.3 hrs |
More narrated by Sean Pratt
Sean Pratt narrates 595 unabridged audiobooks in our catalog, 5,025 hours in all.
- The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma
- 50 Psychology Classics: Who We Are, How We Think, What We Do
- Hidden Valley Road: Inside the Mind of an American Family
- The Body Keeps the Score: Mind, Brain and Body in the Transformation of Trauma
- The Power of Your Subconscious Mind
About as long, on the Science Fiction shelf
1,468 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
Colonel is book 7 of Jonathan P. Brazee's Federation Marine series: a 7.2-hour unabridged recording, read by Sean Pratt, released October 8, 2025, on the Science Fiction shelf.
The listen at a glance
- Length
- 7.2 hrs
- Narrated by
- Sean Pratt
- Released
- October 8, 2025
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Science Fiction
- Series
- Federation Marine #7
- ISBN
- 9798318114786
How to listen to Colonel 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 Colonel audiobook?
Colonel runs 7.2 hours unabridged. At 1.5× speed that drops to roughly 4.8 hours.
Is the Colonel audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates Colonel?
Colonel is narrated by Sean Pratt.