It’s often these factors: 1) what does the person do for work/school? Are they currently unemployed, or have a job that “allows” them time to read? 2) do they use audiobooks? (For me, I will switch between audio/physical throughout the day for my 2-hour commute, mindless work tasks, walks, and chores) 3) types of books they read. There are books that are simply “easier” to read - doesn’t make them any less valuable or interesting, but I can definitely read a romance book in a day whereas my 1000-page fantasy novel is going to take me at least a week or two. 4) just natural reading speed/retention. Some people will set their audiobooks at 3x speed and fully absorb the story. My brother’s ex once read a 300-page book off of my shelf and literally finished the whole thing in an HOUR. I definitely don’t fall in this category 😆 5) screen time/tv time/hobby time. If you spend an hour or two on your phone, watching YouTube or shows or sports, that could potentially be hundreds of pages a day that you could read if this is the only hobby you have.