How Long Does It Take to Record an Audiobook? Human vs AI

Recording: studio time vs finished time

Finished time is what the listener hears. Studio time is everything it took to get there: false starts, retakes, a cough in the middle of a paragraph, water breaks, re-reading a line in a character's voice. Two hours in the booth per finished hour is ACX's estimate; a narrator who stops to fix each mistake as it happens spends longer recording and less time editing.

Voices tire, too, so recording is usually spread over several sessions rather than one long day. Character voices add to it: every switch is a chance for a retake, and a narrator has to keep each voice consistent from session to session.

Editing, proofing and mastering

Editing is the biggest block: about 3 hours per finished hour to remove mistakes, breaths and mouth noise, even out levels and assemble the chapters. Mastering brings each file to store specs. ACX, for example, wants each chapter as a separate file no longer than 120 minutes, as a 192 kbps or higher MP3 at 44.1 kHz, with opening and closing credits in files of their own.

Proofing is a full listen against the text, about 1.2 hours per finished hour by ACX's estimate, to catch misreads and mispronounced names. Every flag becomes a pickup, a short re-recording that has to match the sound of the original session, which is why the last few percent of a recording can drag on.

A realistic audiobook production timeline

Take a 90,000-word novel, about 9.7 finished hours. By ACX's per-hour figures that's roughly 19 hours of recording, 29 of editing and 12 of review: about 60 hours of work. By our arithmetic, at six focused hours a day that's two working weeks for one person, before prep, pickups and scheduling.

Around the recording come the other steps: finding a narrator (on ACX, by posting an audition script and listening to auditions), agreeing terms, sending the final manuscript, and afterwards the store review. A narrator's calendar often matters more than the hours themselves.

How long an AI audiobook takes, and what still needs a person

With AI narration, the recording and most of the editing drop out. FullCastBook generates each chapter from the text, with a narrator and a distinct voice for every character, and there are no breaths or mouth noises to clean up. Generating is the short part.

What remains is human work: preparing the text, checking the detected chapters and speakers, adding a few directions, and listening. A scene might read: NARRATOR: The lamp had burned down to a blue stub. MARA: [whisper, like sharing a secret] He's still on the stairs. TOMAS: [sigh] Then we wait. If Mara's line comes out too loud, you edit the direction and regenerate that one line instead of booking a pickup session.

Proof-listening still takes about as long as the book runs, because someone has to hear every line. That's the step not to skip, human or AI.

Worked example: an 80,000-word novel

At 9,300 words an hour, 80,000 words is about 8 hours 36 minutes of audio. With a human narrator, ACX's per-hour figures give about 17 hours of recording, 26 of editing and 10 of review, roughly 53 hours of work before prep, pickups and scheduling.

With an AI full cast there's no recording or noise editing. By our estimate, plan an hour or two to prepare the text and check chapters and speakers, one full listen of about 8½ hours, and time to fix the lines you flagged: roughly 11 to 13 hours of a person's time in all, depending on the book. For the money side of the same comparison, see how much it costs to make an audiobook.

Store review times after you upload

Upload isn't the finish line. As of October 2026, ACX says its team reviews audio files within 10 business days of submission, and it requires human narration unless otherwise authorized. Kobo Writing Life says an uploaded audiobook is usually in its store within 24 to 72 hours, and Spotify says most books made with its own Audiobook Creation Tools are published within 72 hours. Other stores and distributors set their own times, so check before you announce a release date.

To weigh speed against everything else, read AI vs human audiobook narrator, or follow how to make an audiobook with AI step by step. Plans for a full book are on the pricing page.