Several at once, if you drop the obligation to finish. Naval Ravikant reads 10 to 20 books in parallel and calls the number of books completed a vanity metric. In 2026 I run that with Gemini Notebook (the renamed NotebookLM; free tier 50 sources per notebook, 50 chats a day) as the cross-book index and Readwise Reader ($9.99 a month annual) for capture. The exception is a skill book: read that one alone, start to finish.
Someone searched this site this week for the best strategy for reading multiple books at once versus one at a time, and asked for the psychology behind it. I cannot give you a clean study, because the ones I trust are about practice schedules, not bedside tables. What I can give you is fifteen years of reading as an engineer, a coach and a founder, the method I copied from Naval Ravikant, and the tools that made it work in 2026 when it kept failing before.
Naval’s position, collected in The Almanack of Naval Ravikant, is blunt: read what you love until you love to read, keep 10 to 20 books open at a time, skip freely, reread favorites, and never finish out of obligation. His line that the number of books completed is a vanity metric is the one that changed my behavior, along with his advice to read originals and foundations rather than popular summaries and to put in an hour a day on science, math and philosophy. The reason this works for a founder is not speed. It is that a problem you are living with this quarter makes the right book obvious, and a shelf of open books lets you follow the problem instead of a queue.
The failure of parallel reading is not attention, it is memory. With eight books open I would lose the thread of each one, and every return cost me ten minutes of re-orientation, which is the honest reason most people go back to one at a time. That is the part AI fixed for me. Google renamed NotebookLM to Gemini Notebook on July 16, 2026, and the free Standard tier, per Google’s help pages read this week, gives you 100 notebooks, 50 sources per notebook, 50 chat questions a day, 3 Audio Overviews a day and 10 Deep Research runs a month, with each source up to 500,000 words. Google AI Plus lifts the limits at $4.99 a month and Google AI Pro at $19.99, and since September 2, 2026 usage sits inside a compute meter that refreshes every five hours. I keep one notebook per open question, not per book, with the chapters I have actually read as sources. When I pick a book back up, I ask the notebook what I highlighted last time and which other open book disagreed with it. The re-orientation cost drops to a minute, and the disagreement question is where the thinking happens.
Capture is the other half. Readwise, which includes the Reader app and its Ghostreader assistant, costs $9.99 a month billed annually or $12.99 monthly after a 30-day trial, and it is where highlights from Kindle, PDFs and articles land before I decide which ones deserve a notebook. The Daily Review resurfaces old highlights, which is Naval’s reread habit automated. Two tools, one of them free, is the whole stack; I abandoned a Notion database of book notes years ago because entering notes by hand was work that looked like reading.
The honest exception, and it is a big one. When I read to build a skill rather than to think, parallel reading fails me every time. A book on negotiation, a statistics text, a language grammar: those need one book, in order, with the exercises done, and no notebook summary substitutes for the reps. Naval’s method is for the foundational and the philosophical, where the point is to have the ideas collide. Skill books are practice schedules, and practice does not interleave well at the beginning. The second limit is subtler: a cross-book index makes it very easy to feel you have read a book you only queried. I now count a book as read only if I could argue its case without the notebook open.
| Why you are reading | One at a time or several? | What the AI does | What it must not do |
|---|---|---|---|
| To think about a live problem (strategy, philosophy, history) | Several, Naval-style | Gemini Notebook per question: recall, cross-book disagreement | Replace the reading with a summary |
| To build a skill (negotiation, stats, a language) | One, start to finish | Readwise captures highlights; Ghostreader defines terms | Do the exercises for you |
| To decide whether a book deserves your time | Sample five at once | Notebook Audio Overview of the first chapter, then drop or commit | Become the only version you ever hear |
| To reread a foundation | One, slowly | Readwise Daily Review surfaces your old highlights | Nothing; this is the reps |
What I actually run is the first row most of the time. Six or seven books are open at the moment, one notebook titled with the question they serve, an hour most mornings, and a rule that any book untouched for a month is either shelved or dropped without guilt. I finish perhaps a third of what I start, which Naval would call about right and my younger self would have called failure. The psychology, if you want a one-line version, is that memory follows questions, not page counts, and a tool that holds the question while you read is worth more than any reading speed.
Sources: Justin McKelvey — NotebookLM (Gemini Notebook) pricing and limits, as of September 16, 2026, NotebookLM Updates 2026 — release notes tracker (July rename, August Search rollout), Readwise Reader pricing, The Almanack of Naval Ravikant (free edition).
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