I read a lot in summer, because that’s when I take my main holiday for the year. While I’m on holiday, I can often read a book a day (or more, if they are short).
I still read a couple of books a week during the rest of the year, but how many will depend on what else I’ve got on.
I read less when I’m actively writing and editing my own books – editing involves reading and rereading multiple times. That’s when I’m less likely to read for relaxation, and more likely to watch TV.