Yes, that accruing is linear. I mean there are exponential examples in the religious system, such as more karma required for different things, the lifespans of deities in various realms and the length of the kalpas/ timespans of the ages.

And compared to saying it aloud by yourself it's orders of magnitude more. And when they cram the text into like neat folds with dense text, thats a few more. I just googled, yeah I still google because perplexity on comet is not my thing, 100 trillion prayers on a microfilm is an example I saw.