Citadels on Earth: Audiobook
Book 6 of the Flash Gordon series
According to The Books Insider's catalog data, the Citadels on Earth audiobook runs 3.9 hours unabridged, narrated by Johnny Heller (about 2.6 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 3.9 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 8 days |
| 1 hour / day | 4 days |
| 2 hours / day | 2 days |
| 1 hour / day at 1.5× | 3 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 3.9 hours, it is shorter than 81% of the 13,269 Science Fiction audiobooks in our catalog.
More narrated by Johnny Heller
Johnny Heller narrates 569 unabridged audiobooks in our catalog, 3,574 hours in all.
About as long, on the Science Fiction shelf
370 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
Citadels on Earth is book 6 of Ron Goulart's Flash Gordon series: a 3.9-hour unabridged recording, read by Johnny Heller, released July 14, 2020, on the Science Fiction shelf.
The listen at a glance
- Length
- 3.9 hrs
- Narrated by
- Johnny Heller
- Released
- July 14, 2020
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Science Fiction
- Series
- Flash Gordon #6
- ISBN
- 9781645551652
How to listen to Citadels on Earth 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 Citadels on Earth audiobook?
Citadels on Earth runs 3.9 hours unabridged. At 1.5× speed that drops to roughly 2.6 hours.
Is the Citadels on Earth audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates Citadels on Earth?
Citadels on Earth is narrated by Johnny Heller.