Spaced repetition and flashcards

Spaced repetition has one honest promise and one hidden cost. The promise is that you can hold a large vocabulary with a small daily effort, because the interval between reviews grows every time you pass a card. The cost is that the daily effort is not the number you chose — you choose new cards per day, and what you get is reviews per day, a figure that keeps climbing long after the habit feels established.

The gap between those two numbers is where most abandoned decks come from. Twenty new cards a day sounds modest, and for the first week it is: about 56 reviews a day. By three months it is 119, by a year 153, and it keeps creeping up for years after that toward roughly 220. The workload a learner quits over is never the one they signed up for, and it arrives slowly enough that nothing feels like the moment it went wrong.

These posts cover the scheduling itself, the trade-off between a higher retention target and the review count it costs, what makes a card answerable in five seconds instead of thirty, and how a deck built from something you actually read differs from one built from a word list.

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