Not OP. But suppose you read books from when you are 10 until you are 70. How many books a year? For me, 5-10. Now multiply.
That doesn't seem to be a matter of "not enough time" but "not going to read many books."
Well, everybody is different but I have a stack of to-be-read that I just never get time for. (Almost done How I Wish I'd Taught Maths and next is A Nation of Deadbeats.)
Agree, I can do several books a week if I'm motivated and they're excellent enough to keep me engaged.