How to Learn Faster When You Have No Time to Study

The handover is on Thursday and the first board review is six weeks after that. The division you now run sells into an industry you have never worked in. How to learn faster in that position comes down to six moves: test yourself before you feel ready, space the reviews, mix the subjects, explain it to someone else, sleep properly, and do the real work on a project with a date on it. Rereading, highlighting and watching videos feel like study and produce very little.

The executive version of the problem is specific. You have perhaps an hour a day, often broken into pieces, and you will be judged on what you can do with the knowledge, in a room, under questioning, long before you feel you have finished learning it. The methods below are chosen for that situation.

Why the Methods That Feel Productive Produce So Little

Start with what to stop doing, because it frees the hour.

In 2013 John Dunlosky and four colleagues published a long review in Psychological Science in the Public Interest covering ten learning techniques and how well each held up across different learners, materials and tests. Two came out with a high utility rating: practice testing and distributed practice, which is spacing. Three were rated moderate, including interleaved practice. Five were rated low, among them rereading and highlighting, which the authors note are the techniques most students report using.

Read that list against a typical executive onboarding. The briefing pack gets read twice. The annual reports get highlighted. The induction videos get played at 1.5 speed on the train. The first two sit in the low-utility group, and video is rereading by other means, since the material passes in front of you while you do nothing with it.

The reason these methods survive is that they feel good. The second pass through a document is smoother than the first, and the brain reads the smoothness as knowledge. Roediger and Karpicke found that repeated studying raised students’ confidence that they would remember the material even though it produced worse retention a week later than testing did. Kornell and Bjork found the same gap in their work on mixing topics. People rated the worse method as the better one after seeing their own results.

Nobody gets through our productivity books list without noticing how many of them are read, highlighted and forgotten. Our piece on how to read more books is worth pairing with this one, because the research below changes what counts as having read something.

Test Yourself Before You Feel Ready

The single most useful finding in this field is also the least comfortable to act on. Being tested on material teaches it better than studying the material again does.

Henry Roediger and Jeffrey Karpicke published the study that made the case in Psychological Science in 2006. Students read short prose passages and then either restudied them or took free-recall tests on them, with no feedback given. Five minutes later, the restudy group did better. Two days and one week later, the tested group did substantially better. The authors’ summary line is that testing is a powerful means of improving learning as well as assessing it.

Karpicke went further in Science in 2011, with Janell Blunt, and set retrieval practice against concept mapping, an elaborate study method that many educators prefer. Retrieval won on science texts, on questions that needed inference, and even when the final test was itself a concept map.

For an executive the application is blunt. After every briefing, close the material, and write down everything you can remember about it from a blank start. The margins, the three biggest customers, the regulatory body, the reason the last product failed. Then open the material and mark the gaps. The gaps are the study list. Twenty minutes of this does more than two hours of rereading, and it is unpleasant because it shows how little stuck the first time.

A second version uses other people. Ask your finance director to put five questions to you on Friday about the numbers you were shown on Monday. Our piece on how to take notes effectively pairs well with this, since notes written as questions make the self-testing easy to set up.

Space the Reviews, Then Mix the Subjects

The second high-utility method from the Dunlosky review is spacing, and the clearest large study on it is from Nicholas Cepeda, Harold Pashler and colleagues in Psychological Science in 2008. More than 1,350 people learned a set of facts, came back after a gap of up to three and a half months to review them, and were tested up to a year later. Lengthening the gap between the first session and the review improved final recall up to a point, and the best gap grew as the final test moved further away. For material that had to last a week, the best gap was roughly a fifth to two fifths of that week.

The executive translation is a calendar entry. If the board review is in six weeks, the first return to any topic should be around a week after you first meet it, with further returns spread across the remaining time. Learning everything in the first fortnight and then moving on is the pattern the data argues against. It is also the pattern almost every onboarding plan follows, because it looks thorough on a slide.

Interleaving is the companion move. Nate Kornell and Robert Bjork, in Psychological Science in 2008, had participants study paintings by several artists, either grouped by artist or mixed together. The task afterwards was to identify the artist of paintings they had never seen. Mixing won, which surprised the authors, who had expected that grouping would help people find the pattern. Participants, after seeing their own scores, still said grouping had worked better.

In practice, split the Tuesday hour into twenty minutes of pricing, twenty of the supply chain and twenty of the regulatory position, in a different order from Monday. The sessions feel messier and the recall is better, because each switch forces you to find the right framework for the problem in front of you rather than reuse the one you just put down.

Charlie Munger built a career on holding frameworks from several disciplines at once and reaching for the one that fits. We set out the method in Charlie Munger’s mental models, and interleaving is the study habit that produces it. Elon Musk’s daily routine, as we examined it, has the same shape, with several unrelated problems crossed in a single day, whatever one thinks of the hours involved.

How to Learn Faster by Teaching It Back

The next method needs no materials at all. Learn it as if you will have to teach it.

John Nestojko, Nate Kornell, Elizabeth Bjork and a colleague tested this in Memory and Cognition. Participants studied passages either to prepare for their own test or to teach the passage to another student who would then be tested. Nobody taught in the end, and everyone was tested. The group that expected to teach recalled more of the passage, organised it better, and did particularly well on questions about the main points. Expecting to teach changed how people read, before any teaching happened.

An executive has an easy way to make the expectation real. Tell your chief of staff on Monday that on Friday you will brief them for fifteen minutes on the competitive position of the division, from memory. Then the week’s reading has a shape. You read for the main points because you know you will have to say them aloud to someone who can tell when you are bluffing.

Alex Hormozi’s framing of value, which we broke down in the Hormozi value equation, puts the outcome and its likelihood on top and the time and effort underneath. A Friday briefing that gives a colleague a clear picture in fifteen minutes scores well on every term, and preparing it forces the same compression on you.

Naval Ravikant’s case for specific knowledge, which we tested in Naval Ravikant’s How to Get Rich, is a case for knowledge that cannot be picked up from a course. Teaching it back is the quickest test of whether you have any yet.

Sleep Is Part of the Study Plan

Sleep is the method executives most often cut to make room for the others.

The US National Institute of Neurological Disorders and Stroke puts it plainly on its public page on sleep: without sleep you cannot form or maintain the pathways in the brain that let you learn and create new memories, and memory consolidation most likely requires both non-REM and REM sleep. Harvard’s Division of Sleep Medicine describes two separate effects. A tired brain takes in less during the day, and the consolidation that stabilises what was taken in happens during sleep afterwards. Its summary is that a full, unbroken night is the condition under which learning and memory work best.

So the Thursday night spent reading until one in the morning before the Friday briefing is a double loss. The reading goes in badly, and the night that would have fixed Monday to Wednesday’s learning in place is shortened. The better trade is forty minutes of retrieval practice at nine and lights out at eleven.

Holding to that when the deadline is close takes discipline of the dull kind. The practical answer, which our piece on how to increase willpower expands on, is to make the rule once and build it into the evening, so the decision never comes up fresh at ten to midnight.

Learn It on a Real Project With a Date Attached

The last method organises the other five, and it is our own position; no laboratory tested it as such.

Pick one real piece of work in the new domain that has to be delivered by a date you cannot move. A pricing proposal for one customer. A root-cause review of one failed order. A one-page view of the regulatory exposure for the board. Then learn whatever that project demands, in the order it demands it, and nothing else until it is done.

The reason this works is that it forces the other five methods without you having to schedule them. A project makes you retrieve, because you have to produce rather than recognise. It spaces the reviews, because you return to each topic as the work needs it over several weeks. It interleaves, because real problems do not arrive sorted by subject. And it hands you a teaching moment, because somebody will read what you produced and ask questions about it.

Anyone contemplating a career change at 50 is facing the six-week problem stretched over a year, and the advice is the same. Find a real piece of work in the new field and let it set the syllabus. Our guide to transferable skills examples is useful here, because a project in a new domain is where you find out which of your old skills carry across and which do not. If a formal course is part of the plan, our piece on online courses for career change is the place to start, and the test to apply is whether the course ends in a deliverable.

This is also where the hours argument lands. We wrote in work smarter not harder that the first year in a new function is a working-harder year whatever the career advice says. That remains true. The methods here leave the hours in place and stop them being spent on the second reading of a document that was never going to stick. That is as close to an answer on how to learn faster as the evidence allows.

The Six Methods in One Week

The table puts the methods together with the evidence behind each in a line and what an executive does with it between Monday and Sunday.

Method	The evidence in one line	How an executive applies it in a week
Retrieval practice	Roediger and Karpicke, 2006: tested students beat restudying students at two days and one week	After every briefing, write what you remember from blank, then mark the gaps
Spacing	Cepeda and colleagues, 2008: over 1,350 learners, longer gaps between study and review improved recall up to an optimum	Return to each topic about a week after first contact, then again before the review
Interleaving	Kornell and Bjork, 2008: mixed study beat grouped study at recognising new examples	Split each hour across three subjects in a different order each day
Teaching it back	Nestojko and colleagues: expecting to teach improved recall and organisation without any teaching	Book a fifteen-minute Friday briefing to a colleague, from memory
Sleep	NINDS and Harvard Sleep Medicine: consolidation happens during sleep and needs a full night	Stop at eleven; move the late reading to the next morning
A real project with a date	Our position: it forces all five of the above	Pick one deliverable the board will see and let it set the reading list

Rereading, highlighting and passive video do not appear in the table, because the Dunlosky review puts the first two at low utility and the third shares their defining fault. The material moves and the learner does not.

Six Weeks, Honestly Described

Anyone asking how to learn faster deserves a straight account of what the six weeks feel like. Week one is the worst. Retrieval practice on day two produces a near-blank page, the Friday briefing is thin, and the temptation to go back to the comfortable second reading is strong. Hold the method anyway. The blank page is the diagnosis, and the gaps it shows are what week two is for.

By week three the spaced returns start paying. Topics met in week one come back and some of them are still there. The Friday questions get harder, which is the sign that the colleague now believes you know something.

Weeks four to six are the project. The reading narrows to what the deliverable needs, the interleaving happens on its own because the problem crosses subjects, and the board review becomes a presentation of work you have done. You will still not feel finished. Nobody does at six weeks.

Frequently Asked Questions

Is there a fastest way to learn a new industry in a few weeks?

Retrieval practice on a real project. Pick one deliverable with a date, learn what it demands, and test yourself from a blank page after every briefing rather than rereading. The Roediger and Karpicke study found that tested learners held material substantially better than rereaders after a week, which is the timescale that matters here.

Does highlighting help at all?

Not much. The Dunlosky review of ten techniques rated highlighting and rereading as low utility, despite both being the methods most learners say they use. If you must mark a document, turn each highlighted line into a question you can test yourself on later.

How much sleep does learning need?

Harvard’s Division of Sleep Medicine describes a full, unbroken night as the condition under which learning and memory work best, and the NINDS page states that consolidation most likely needs both non-REM and REM sleep. Cutting the night to fit in more reading costs more than the reading gains.

The six weeks will pass whatever you do with them. Spend them on the methods that feel uncomfortable and stick, and by the review you will be able to take questions on the division from a blank start, which is the only test the room applies.