How long does it take to read a book?

Five and a half hours is what the arithmetic produces for a typical 300-page novel. Divide its roughly 80,000 words by the average adult silent reading rate of 238 words per minute¹, round to the nearest half hour, and there it is. Most readers land somewhere between four and eight hours total, depending on the genre, the difficulty of the prose, and how much of that time they are actually reading versus holding the book while thinking about something else.

That five-and-a-half-hour figure is real and worth knowing. What to do with it is the more interesting question.

The question behind the question

Nobody reads a book in a single five-hour block. The relevant unit for most people is the session: 20 minutes before bed, 40 minutes on a Sunday morning, whatever fits. The total hours only become useful once you convert them into sessions, and the sessions only become meaningful once you have some sense of how often you will actually sit down.

At 20 minutes a day, a 300-page novel takes about 17 days. At 30 minutes, roughly 11 days. At 10 minutes, which sounds almost pointlessly short but is a reasonable starting point for anyone building a habit from scratch, you finish in about five weeks. That is 12 books a year. Most people would be quietly satisfied with 12 books a year.

The figure that tends to land hardest: the median American adult finishes five books per year². A 10-minute daily session, held consistently, more than doubles that without requiring any particular heroism.

Why your speed is probably not what you think

Most readers who have never timed their sessions assume they read faster than they do. The gap comes down to invisible pauses: re-reading a paragraph, stopping to think, looking up a word, setting the book on the nightstand for a moment and picking it back up three minutes later. Uninterrupted reading time is reliably shorter than the total time a book spends open in front of you.

Genre matters more than most people account for, too. Dense nonfiction, anything built around unfamiliar concepts or compounding arguments, typically takes two or three times as long per page as fiction in a familiar register. A few pages of Kuhn’s The Structure of Scientific Revolutions will cost considerably more time than the same page count of a readable thriller, assuming you are actually trying to retain what Kuhn is arguing. If you estimate your nonfiction reading time using your fiction pace, you will consistently underestimate it, which is its own kind of discouragement.

The practical upshot: give yourself more runway than the arithmetic suggests for nonfiction, and less pressure than you probably apply to fiction.

What your actual speed unlocks

The population average of 238 words per minute is a starting point, not your number. Reading speed shifts by person, by genre, and by how tired you are. The only way to know your real pace is to measure it across a few genuine sessions.

This is what Moth’s reading timer is for. Start it when you open the book, stop it when you put it down. After a few sessions, the app calculates your reading speed and projects how long the current book will take at your current pace. The projection is imperfect, because pace shifts and life interrupts, but it is far more accurate than anything you can produce by guessing.

The more practically useful output often shows up in the weekly wrap: how long your sessions actually are on average. Most readers who look at this number for the first time find it lower than they expected. That is useful data, not a verdict on your reading life. It tells you what your baseline is, which is the only sensible place to set a daily goal from.

The variable that moves the needle

Reading speed is harder to shift than most productivity advice implies, and pushing for faster tends to reduce comprehension in ways that undermine the point. The variable that genuinely matters is session frequency.

A reader at 200 words per minute who opens a book every evening for 15 minutes will finish more books in a year than someone at 350 words per minute who reads irregularly on weekends. Consistency compounds in a way that speed does not. The sessions accumulate; the pages turn; the books finish without any particular sense of effort or urgency.

Tonight, check how many pages you have left in whatever you are currently reading. Divide by 30 for a rough estimate of the remaining hours. Then pick a number of days that seems reasonable and see what daily session that implies. If the answer fits in your evening, that is your goal.

Footnotes

1. Brysbaert, M. (2019). How many words do we read per minute? A review and meta-analysis of reading rate. Journal of Memory and Language, 109, 104047. https://doi.org/10.1016/j.jml.2019.104047 ↩

2. Pew Research Center (2022). Three-in-ten Americans now read e-books. https://www.pewresearch.org/short-reads/2022/01/06/three-in-ten-americans-now-read-e-books/ ↩