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計測した動画から分かったこと

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 36% 役立つ部分が始まる中央値 0:47 再計算済み 19 Oct 2026

  1. データレポート2026/10/1512分

    How much of a YouTube video is actually worth watching? We measured, minute by minute

    We scored every minute of a library of learning videos. The median video earns 57% of its runtime, the first and last tenth earn least, and the title predicts a skip.

  2. データレポート2026/10/158分

    The best YouTube channels for learning, by subject: measured video by video (2026)

    The top three educational YouTube channels in each of 16 subjects, ranked by the median score of their measured videos, and why even the best channels are not gold every time.

  3. 記事2026/9/305分

    Gistil vs Eightify: a verdict before you watch, or a summary instead of watching

    Eightify summarizes YouTube videos. Gistil tells you whether one is worth your time, then plays only the useful parts. An honest side-by-side for 2026.

  4. 記事2026/9/3010分

    The best AI YouTube summarizers in 2026: eleven tools compared

    Eleven AI video summarizers and YouTube tools compared on 15 October 2026: what each outputs, which tell you if a video is worth watching, prices, and accuracy.

  5. 記事2026/9/46分

    How to Know If a YouTube Video Is Worth Watching Before You Watch It

    Learn how to decide whether a YouTube video is worth watching before you spend 20, 45, or 90 minutes on it.

  6. 記事2026/9/49分

    How to Learn From YouTube: Study With Videos Worth Your Time

    How to learn from YouTube without passive watching: pick videos worth your time, start at the useful part, and turn watching into progress toward a goal.

  7. 記事2026/9/46分

    How to Stop Wasting Time on YouTube and Watch Videos More Efficiently

    Stop wasting time on YouTube with a simple system for choosing better videos, avoiding recommendation loops, finding key ideas faster, and watching more efficiently.

  8. 記事2026/9/15分

    Why a summary of a long video reads so well and helps so little

    A summary is a compression, and the things it loses are the things that made the video worth watching. Four failure modes, and the one job summaries are genuinely good at.

  9. 記事2026/9/15分

    What Gistil shows you on a YouTube page, and why each part is there

    A verdict, three numbers, and the receipts behind them — shown next to the video before you press play. Here is every part of the panel and what it is claiming.

  10. 記事2026/9/15分

    A tutorial from three years ago may not work any more. How to check before you start

    Six minutes into a tutorial the button it names is gone. Here is how to tell which old tutorials are safe, which are not, and why the date is the wrong thing to check first.

  11. データレポート2026/9/16分

    The eight-minute pile-up: where runtimes cluster, and what it costs

    Runtimes pile up the moment a video passes eight minutes. The pile is real and easy to see. The penalty everyone assumes comes with it is not.

  12. データレポート2026/9/16分

    Sponsor reads take 1.6% of the runtime. Padding takes 40%.

    One in five measured videos carries a sponsor read, and it runs about sixty-seven seconds. The thing that actually spends your time is somewhere else entirely.