How long should a YouTube hook be?
The right hook length depends on format. Long-form YouTube: 12-18 seconds. Shorts: 1.5-3 seconds. TikTok: 1-3 seconds. Reels: 1.5-3 seconds. Here's why those windows hold across millions of analyzed videos.
You have until ~second 18 before the average viewer decides. Use the window for promise, stakes, and proof.
Decision time is 1.2-1.8 seconds. Single pattern interrupt + single promise — anything else is overhead.
Audio-only allows longer hooks because there's no scroll. Use the time to set up the most surprising claim of the episode.
Frequently asked
Yes — under 6 seconds for long-form leaves no room for the curiosity gap to land. Viewers drop because the hook felt unfinished.
Indirectly. The algorithm measures retention, not hook length. But hook length is the single biggest lever on early retention, which is the algorithm's primary signal.
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