[fabianholzer]

> I'm not sure how "estimated reading time" works for non-english speakers. >

Do you mean for non-native speakers reading English material or for material in other languages when read by native speakers with an average reading competence in their native language?

Anyhow, as a non-native English speaker, it implemented it on my site by showing both the word count, as well as an estimated time, which is simply calculated by dividing the word count by a constant number of assumed words per minute.

That number was guesstimated by doing some reading speed tests on myself and researching average reading speeds and rounding up to 10 wpm. I have to admit that my assumption of 240 words per minute does not hold up to any scientific scrutiny, but otoh it is an estimation.

It works ok for prose. As soon as other notation is mixed in (code, math, graphs, diagrams etc.pp) that begins to naturally to vary wildly in accuracy.