What to Do After a Lecture: A 24-Hour Review Routine
After a lecture, the first step is also the shortest: close your notes and write down what you remember. This guide turns that step into a 24-hour routine with a timeline for the first ten minutes, that evening, the next day and one week later.
The routine rests on three findings we explain below. In classic experiments with nonsense syllables, forgetting was fastest soon after learning. In two experiments, testing yourself beat restudying when the final test came days later. And sleep supports consolidation, the process that stabilizes new memories. The specific timings are our suggestions, because no study we cite tested this exact routine.
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What the research says about the first day
The classic forgetting experiments appeared in a book first published in German in 1885. In the 1913 English translation, Ebbinghaus learned series of nonsense syllables, which are made-up letter groups with no meaning, and measured how much effort it took to relearn them after delays from about a third of an hour to 31 days. In his data, forgetting was rapid at first and then became slower (Ebbinghaus, 1913).
A 2015 replication tested relearning after intervals from 20 minutes to 31 days and got results similar to his curve, with a small jump upward from the 24-hour point (Murre and Dros, 2015). Both studies had very few participants, used nonsense syllables, and measured how much relearning effort was saved, not how much of a lecture a student remembers. So we borrow only the general shape, fast early and slower later, and we do not quote percentages.
Testing yourself matters too. In two experiments, students studied prose passages and then either took recall tests or restudied. When the final test came 2 days or 1 week later, repeated testing led to better recall than repeated restudying. After only 5 minutes, restudying looked better. Restudying also made students more confident that they would remember, even though they remembered less on the delayed tests (Roediger and Karpicke, 2006). It was laboratory work with prose passages, and it does not promise higher grades.
On sleep, one review explains that sleep has been identified as a state that optimizes the consolidation of newly acquired information, depending on the conditions of learning and the timing of sleep (Diekelmann and Born, 2010). We are not claiming that reviewing right before bed beats another time, and we give no sleep advice. Our reading is only that the night between the lecture and your next-day check is part of the routine, not a gap in it.
The 24-hour timeline
| When | What to do | Example time | Why (our reasoning) |
|---|---|---|---|
| Within about 10 minutes of the lecture ending | Close your notes and write what you remember: main points, one example, one open question | 10 minutes | You try recall before you look |
| Same evening | Compare with your notes in a different color, then turn five to eight key points into questions | 15 minutes | Feedback, plus material for later reviews |
| Next day | Answer those questions without notes, then check | 10 minutes | A delayed test shows what held |
| One week later | Answer again the questions you missed | 10 minutes | A second, wider gap |
In this example the whole routine takes about 45 minutes spread over a week. Shorten it freely. The order matters more than the minutes: recall first, check second, test again after a gap.
How to run each step
Step 1: blank-page recall
Set a timer and write in plain words without looking at anything. Leave a gap or a question mark where your memory fails, because the gaps show you what to fix. Do not correct yourself yet.
Step 2: turn notes into questions
Check your page against your notes. Feedback helps here: retrieval practice is often effective even without feedback, but feedback enhances the benefits of testing (Roediger and Butler, 2011). Then turn each key claim into a question that asks for it.
Cards made this way can go straight into Practice, which uses a simple model inspired by the Leitner system. A new card answered right goes to box 2 and returns two days later, and a miss sends it to box 1 for a return the next day. For more ways to answer from memory, see the active recall guide.
If you cannot do all four steps
Keep the first step and the next-day test. A major review rated practice testing as high utility, rated rereading as low utility, and suggested using practice testing in place of rereading (Dunlosky et al., 2013). If your only time is five minutes, spend it recalling, not rereading.
This routine feeds the rest of your study system. The forgetting curve explained guide goes deeper on the Ebbinghaus data, and sleep and memory for students covers the consolidation research in more detail. Within your week, the weekly review plan shows where these steps fit, the daily review habit guide keeps them small, and how many new flashcards to add each day helps you avoid turning every lecture into a mountain of cards. To try the card step now, open a practice deck.
Common mistakes
- Rereading or recopying your notes as the review. Close the notes and recall first. The review we cite rated rereading as low utility and suggested practice testing instead.
- Waiting until the weekend to look at lecture notes. Do ten minutes of recall the same day. In the classic data, forgetting was fastest early, so a short early check is a sensible bet.
- Skipping the comparison with your notes. Check every answer. Feedback enhances the benefits of testing, and it shows you which answers were wrong.
- Turning every line of the lecture into a card. Pick the key claims, one idea per card. Each card adds reviews later, so a smaller set is easier to keep up.
- Treating the timeline as a rule. It is a starting point. Results vary between people, so shorten or stretch the gaps to fit your week.
Frequently asked questions
How soon after class should I review?
No study we cite tested a delay for lecture review. Forgetting was fastest early in the classic experiments, so we suggest a first recall within minutes and a second check the next day. Treat the timing as a starting point, not a requirement.
Should I rewrite my notes after class?
We found no verified study on rewriting notes. The sources we cite favor answering from memory over rereading, so try a blank-page recall first. Rewrite only the parts you could not recall.
Is it okay to review right before bed?
Nothing we cite says it is bad or that it is better. The sleep review describes consolidation as depending on the conditions of learning and the timing of sleep. Choose a time you can keep.
How long should the whole routine take?
In our example it takes about 45 minutes across a week: 10, 15, 10 and 10 minutes. Cut it down if you attend several lectures a day, and keep at least the first recall and the next-day test.
Sources
We opened each source below before citing it. See Methodology and Sources for how we check them.
- Ebbinghaus, H. (translated by H. A. Ruger & C. E. Bussenius) (1913). Memory: A Contribution to Experimental Psychology. New York: Teachers College, Columbia University (English translation of Über das Gedächtnis, 1885). Open the source
- Murre, J. M. J., & Dros, J. (2015). Replication and Analysis of Ebbinghaus' Forgetting Curve. PLOS ONE, 10(7), e0120644. Open the source
- Roediger, H. L., & Karpicke, J. D. (2006). Test-Enhanced Learning: Taking Memory Tests Improves Long-Term Retention. Psychological Science, 17(3), 249-255. Open the source
- Roediger, H. L., & Butler, A. C. (2011). The critical role of retrieval practice in long-term retention. Trends in Cognitive Sciences, 15(1), 20-27. Open the source
- Diekelmann, S., & Born, J. (2010). The memory function of sleep. Nature Reviews Neuroscience, 11(2), 114-126. Open the source
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving Students' Learning With Effective Learning Techniques: Promising Directions From Cognitive and Educational Psychology. Psychological Science in the Public Interest, 14(1), 4-58. Open the source
This guide is general study help, not medical or professional advice. It was last reviewed on November 12, 2026. Spot a mistake? Tell us here.