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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2026/9/17分

    A chapter list tells you where things are, not which one is worth watching

    Section by section across 3,243 videos. The parts a chapter list would call content vary by 34 points inside a single video, and length barely predicts which is which.

  2. 記事2026/8/265分

    How to build a watch-later list you actually finish

    The list keeps growing because saving is free and watching is not. One rule, applied at the moment you save, fixes most of it.

  3. データレポート2026/8/266分

    The shape of a YouTube video: 3,179 value curves overlaid

    Average measured value climbs fast, holds through the middle two-thirds of a video, then falls sharply near the end. Here is the curve, from 3,179 videos.

  4. 記事2026/8/266分

    How to stop wasting hours on YouTube tutorials that go nowhere

    A four-question filter to run before you press play, built from measuring how much of a typical tutorial actually delivers versus how much just restates itself.

  5. 記事2026/8/265分

    How to tell a good tutorial from a bad one in thirty seconds

    Six signals readable from the page before you commit any time, each tied to something we can actually measure across the library rather than a hunch.

  6. 記事2026/8/266分

    How to skip to the part of a YouTube video that actually matters

    Five ways to find the useful part of a video without watching the setup, ranked from the one everybody already tries to the one that works before you press play.

  7. 記事2026/8/265分

    How to search inside a long video without watching the whole thing

    Browser search only reaches the text on the page, not what's said. Chapters, comments, and the written record of the video each cover a different gap.

  8. データレポート2026/8/266分

    Runtime is a useless filter: longer videos carry less padding, not more

    Padding falls from 45% under ten minutes to 28% over an hour, and measured value rises the same way. Picking the shorter video is, on average, backwards.

  9. 記事2026/8/265分

    Is watching at 2x speed actually helping you learn?

    Speed compresses a video uniformly, filler and substance alike. Where doubling the speed helps, where it quietly breaks comprehension, and what it does not fix.

  10. 記事2026/8/265分

    How to find advanced material when everything YouTube recommends is beginner-level

    Search tricks and channel patterns that reliably surface advanced material, and why the ordinary search results skew introductory in the first place.

  11. 記事2026/8/265分

    How to evaluate a YouTube channel before you subscribe

    Three channel-level signals that predict whether a creator is worth following, separate from whether any single video of theirs was good.

  12. データレポート2026/8/265分

    Which subjects are worth your time: measured value across twenty subjects

    Science scores highest of twenty measured subjects at 66.9; travel lowest at 38.4. The same subjects also carry the least padding and the most honest titles.