The Forever Formula: Audiobook
Book 1 of the Hart Brothers series
According to The Books Insider's catalog data, The Forever Formula runs 4.1 hours as an unabridged audiobook, narrated by Sebastian York and Erin Mallon (about 2.7 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 4.1 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 9 days |
| 1 hour / day | 5 days |
| 2 hours / day | 3 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 4.1 hours, it is shorter than 88% of the 16,241 Modern audiobooks in our catalog.
Catching up on The Hart Brothers
This is book 1. Books 1 to 2 run 8.3 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | The Forever Formula | 4.1 hrs |
| 2 | The Marrying Kind | 4.1 hrs |
More narrated by Sebastian York
Sebastian York narrates 305 unabridged audiobooks in our catalog, 2,735 hours in all.
About as long, on the Modern shelf
623 Modern 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
The Forever Formula is book 1 of Kendall Ryan's Hart Brothers series: a 4.1-hour unabridged recording, read by Sebastian York and Erin Mallon, released October 24, 2023, on the Modern and Drama shelves.
The listen at a glance
- Length
- 4.1 hrs
- Narrated by
- Sebastian York, Erin Mallon
- Released
- October 24, 2023
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Modern, Drama
- Series
- The Hart Brothers #1
- ISBN
- 9781666651669
How to listen to The Forever Formula 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 Forever Formula as an audiobook?
The Forever Formula runs 4.1 hours unabridged. At 1.5× speed that drops to roughly 2.7 hours.
Is The Forever Formula free as an audiobook?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates The Forever Formula?
The Forever Formula is narrated by Sebastian York and Erin Mallon.