It is the question hiding inside every trailer brief: how long should this thing be? Authors usually guess too long. The honest answer, after making trailers for books in every genre, is that 30 to 60 seconds is the sweet spot. Long enough to hook a stranger, short enough that they watch to the end. Here is why that range works, what each platform rewards, and when breaking the rule makes sense.
Attention is the currency and it spends fast. On social feeds, most viewers decide whether to keep watching within the first three seconds. Completion rates, the share of viewers who watch to the final frame, fall off sharply after the one minute mark. A 45 second trailer watched to the end beats a two minute trailer abandoned at second twenty. Every time.
Shorter also forces discipline. A trailer cannot summarize your book, and it should not try. It has one job: make a stranger curious enough to click. Curiosity is built fast or not at all.
Different platforms have different norms. Cut to the room you are playing in. We covered where trailers earn their views in our guide to whether book trailers sell books, and length is half of that equation.
Keep it under 60 seconds, and aim for 30 to 45. These feeds are built for speed, and the algorithm favors videos people finish. A tight 35 second trailer with a strong hook will outperform a 90 second cutdown every single week.
YouTube viewers arrive with slightly more patience. Sixty to 90 seconds works here, especially for series trailers or documentary style pieces where the audience chose to press play. Our own documentary trailers live here, and they run longer because the viewer opted in.
On a book page or your author site, 30 seconds is plenty. The visitor is already interested in the book. The trailer just needs to close the deal, not introduce it.
Rules have exceptions. Documentary style trailers, the kind we make for nonfiction and true crime, can run two to three minutes because they are telling a real story, not teasing one. Series trailers that introduce a whole world sometimes earn 90 seconds. The test is always the same: does every extra second earn its place? If a scene does not build curiosity, cut it.
A trailer is a promise, not a summary. Make the promise fast, and make it impossible to ignore.
If your draft runs long, these are the first things to go:
Before you lock any cut, watch it on mute. Most social video is first encountered without sound, and a trailer that only works with the volume up loses half its audience before the first line lands. If the story reads clearly through visuals and text cards alone, the sound design becomes a bonus rather than a crutch. This is one reason we deliver text card versions alongside voiced cuts: the trailer has to sell in a silent feed first.
Make one main trailer at 45 to 60 seconds, then cut a 30 second version for reels, TikTok, and Shorts. Two assets, one production, every platform covered. That is exactly how we deliver: our complete $600 book trailer package includes platform cut versions, so the same story plays at the right length everywhere it appears.
For social feeds, usually yes. Completion rates drop hard after 60 seconds. Ninety seconds can work on YouTube or your own site, where viewers chose to watch, but keep the social cut at 30 to 45 seconds.
Thirty to 45 seconds. TikTok rewards videos people finish, so a tight trailer with the hook in the first three seconds will travel further than a longer one.
One trailer, several cuts. Aim for a 45 to 60 second master, then trim a 30 second version for vertical feeds. Our packages include those platform versions so you never have to choose.
Tell us about your book and we will build a trailer cut to the perfect length for every platform, usually delivered within a few weeks.