We calculate hours by estimating the average length of each recording, and then multiplying that number by the total number of recordings across all languages.
Yeqetaj ri taq ramaj rik'in ri runik'ajal ruyakoj, k'a ri' niqatïk ri ajilab'äl ri' rik'in ri chijun rajilab'al yakoj pa ronojel ri ch'ab'äl.