You can add fifty new words in an evening. By next week most of them feel fuzzy. That is not a willpower problem. It is what happens when introduction volume outruns review.
The useful question is not “how many can I meet today?” It is “how many can I still recall next week without cheating?”
A sustainable range: about 7-15
For most people with a real life, 7 to 15 new words per day is a range that can stick if you also review what is due. Some days you will do five. Some days twelve. The point is a pace you can keep for weeks, not a personal record on Sunday.
Below that range is fine when life is loud. Above it often means you are stacking cards you will not meet again in time. More introductions without reviews is just a longer forgetting list.
If you want the longer story of that drop-off, start with Why You Forget 80% of New Words.
Retention beats introduction volume
A deck that grows by thirty a day and never gets honest reviews is theater. A smaller set that you actually recall is progress.
Think in two buckets:
- New: words you have never reviewed (or only once).
- Due: words the schedule thinks you are about to lose.
On a busy day, clear due first. Then add a few new ones if you still have energy. Flipping that order (new first, due never) is how backlogs and “I swear I knew this” moments grow.
Honest ratings matter more than the daily count
Whatever scheduler you use, including adaptive ones like FSRS, it only knows what you tell it. Mash “easy” on a word you barely produced, and the next interval will lie to you. Rate hard when it was hard. That is how the schedule stays useful.
For plain-English FSRS without a settings rabbit hole, see What FSRS means for vocabulary.
Also: quality of the card beats quantity of cards. A vague English gloss is easy to “pass.” A cue you can picture (and a word you actually need) is harder to fake and easier to keep.
What this is not
This is not a fluency promise. It is not “X words a day equals fluent in Y months.” Languages need grammar, listening, and use. Vocab intake is one habit inside that mix.
It is also not a contest with someone else’s streak or word count. Your review load is personal. Their thirty new words might be your ten, if their due pile is empty and yours is not.
A small practice you can start today
Pick a daily ceiling you can keep for two weeks (try ten). Each day:
- Do due reviews first. Rate honestly.
- Add up to your ceiling in new words you will actually use.
- Prefer cards with a clear cue (image or short context), not a naked gloss.
- If due reviews already feel heavy, add zero new words that day. That still counts as a good day.
If you want that review loop explained in product terms, open How Vidi Works when you are ready.