Andrew Huberman· PhD
I think most people find that one or two of these really deep focus, 90-minute work blocks are about what one's schedule and even mind can handle.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
I think most people find that one or two of these really deep focus, 90-minute work blocks are about what one's schedule and even mind can handle.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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So combined, that's just three hours of focused work, which may not seem like a lot, but if you were to dissect your day and kind of look at the arc and structure of your day, I'd be willing to bet that if we added up the total period of time in which you were in what Cal Newport would call deep work, really focused, dedicated work, that it would probably amount to about three or four hours.