Reading books is honestly overrated. Especially popular non-fiction.
If you are reading for pleasure, then so long as you are pleased, any number is fine.
If you read for knowledge, you should be able to see if you have any chances of applying the knowledge to your life. Unused knowledge is at best, useless, at worst, dangerous (too many valueless thoughts taking by brain CPU cycles).
I used to read ~30 books a year. Only read 10 books last year.
This year it might even be fewer.
But each and every book I read adds value to the fields I am focused on (history, religion and a little bit of non, pop sci fiction).
If you are reading for pleasure, then so long as you are pleased, any number is fine.
If you read for knowledge, you should be able to see if you have any chances of applying the knowledge to your life. Unused knowledge is at best, useless, at worst, dangerous (too many valueless thoughts taking by brain CPU cycles). I used to read ~30 books a year. Only read 10 books last year. This year it might even be fewer. But each and every book I read adds value to the fields I am focused on (history, religion and a little bit of non, pop sci fiction).