I’m an avid reader, but those numbers are beyond me. My granddaughter started reading at three and by six she had read all the Harry Potter novels appropriate for her age (later editions get a little dark). When I send her a series of books from Amazon she reads them in one day, or two, as she has school, family time and sleeps.
What I find with peers is that in our conversations I can tell them things they don’t know if most of their reading is fiction. Branch out with autobiographies, history, and the like. So much to know that we don’t know.