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Me, yes: https://www.gwern.net/Spaced-repetition#how-much-to-add

The XKCD comic you're thinking of is much more general^: https://xkcd.com/1205/

^ and not too helpful here because it assumes you know how much time something saves/costs - which isn't obvious for spaced repetition because the entire point is to dynamically adjust the timing & number of repetitions over the long run.

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