Baldur Bjarnason on Nostr: To be meaningful, a reading time estimation algorithm needs to take a number of these ...

To be meaningful, a reading time estimation algorithm needs to take a number of these variables into account. The bare minimum would combine text complexity, usually estimated as a combination of sentence complexity (writing style) and vocabulary, with length and the median level of schooling of the assumed audience to get a rough estimate. This would only even be vaguely correct for a reader with the estimated schooling

So how do all of these sites and tools estimate reading time?