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現場ノート計測済みライブラリから

計測した3,487本の動画から学んだこと

私たちはYouTube動画を、尺のどれだけが実際に価値を届けているかで評価します。これは、数がそろって初めて見えてきたパターンです。

水増しの中央値 40% 役立つ部分が始まる中央値 1:00 再計算済み 4 Sep 2026

  1. データレポート2026/8/265分

    How long is a lesson, really: runtime measured across twenty subjects

    Median runtime runs from 18:16 in history to 9:30 in productivity, nearly two to one. It has almost no relationship to which subjects score highest on value.

  2. データレポート2026/8/265分

    Do YouTube titles tell the truth? Honesty measured across twenty subjects

    Average title honesty is 81 out of 100, from 87 in science down to 73 in travel. The same subjects that oversell titles also carry the most padding.

  3. データレポート2026/8/257分

    The useful part of the median measured video starts at 1:02

    Across 3,243 measured videos the useful part starts at 1:02, and one in ten makes you wait past 3:47. Here is how that splits across twenty subjects.

  4. データレポート2026/8/257分

    We measured the padding in 3,002 videos. The number has not moved.

    A second padding census, on 3,002 measured videos. The median is still 40%, the library has grown by three quarters, and the distribution barely moved.

  5. データレポート2026/8/257分

    We measured 3,243 YouTube videos. One hundred of them were advanced.

    One hundred of 3,243 measured videos were pitched above intermediate. Here is which subjects have none at all, and the one signal that finds the rest.

  6. データレポート2026/8/257分

    One in five measured videos was not worth the time it asked for

    659 of 3,243 measured videos were not worth their runtime. The share runs from 5% in science to 64% in travel, and the title predicts it before you click.

  7. 記事2026/8/204分

    How to tell if a YouTube video is worth watching before you press play

    Six signals you can read from the page in about twenty seconds, ranked by how well they actually predict whether the video delivers.

  8. 記事2026/8/195分

    Why YouTube videos feel three times longer than they need to be

    We measured the padding in nearly two thousand videos. It is not the sponsor segment, and it is not where most people think it is.

  9. 記事2026/8/185分

    What "value density" means, and how we measure it

    The three numbers Gistil puts on a video, what each one is actually claiming, and the places where they do not apply.

  10. データレポート2026/8/177分

    We measured 1,893 YouTube videos. This is how much of them was filler.

    A padding census across fifteen categories: the median video is 40% structure, and the long ones are the least padded, not the most.