Reading a long book is just a matter of how much free time one has. Its not really an impressive accomplishment, however if you struggle at reading I could see it being a goal of sorts for yourself.

writing a book would be a recognizable feat. Writing a great book is a big accomplishment.

That said, if youre comparing, reading the book to me is better for comprehension than listening but thats different for us all.

Bonus points for doing both simultaneously.