I was a voracious reader when I was young and didn't have anything better to do, but I would never have managed that many books.
Apparently my reading speed is about 330 words per minute; a short novel is about 50,00 words so would take about 2.5 hours to read, 9 short novels a week is about 3.25 hours a day.
I no longer read that many books, but the OH does. She gets about 6 books a fortnight from the library and claims a similar number on her kindle so that would be 300 or so a year. (She does spend a lot of time reading!)
Mind you, she's just started Anna Karenina and that's slowed her down a lot.