Why does watching a video at 1.25 speed decrease the time by 20%? And 1.5 speed decreases it by 33%?

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I guess this reveals how fucking dumb I am. I can’t get the math to make sense in my head. If you watch at 1.25 speed, logically (or illogically I guess) I assume that this makes the video 1/4 shorter, but that isn’t correct.

In short, could someone reexplain how fractions and decimals work? Lol

Edit: thank you all, I understand now. You helped me reorient my thinking.

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29 Answers

Anonymous 0 Comments

At 1.5 speed, you’re watching 1.5 seconds per real-life second. If the original video took x seconds, then the sped-up video takes (x / 1.5) seconds.

* Watch Time = x / 1.5
* Watch Time = x / (3 / 2)
* Watch Time = 2/3 x

So the watch time is 2/3rds of the original time…so decreased by 1/3.

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