Spaced repetition can allow for infinite recall
I mean sure. The trouble is in order to keep the review time per day fixed you need to vary the rate at which you introduce new facts, and as time goes on the interval between when you can afford to introduce new facts will grow to be infinite.<p>The model also doesn&#x27;t account for how you feel about doing this activity. This includes the pain of not doing reviews for several days and then having to catch up. The probability you eventually throw in the towel is also a function of how useful you&#x27;re finding the activity, which in this case since we&#x27;ve opted to keep the per-day study time as fixed will likely be when the interval that you are required to wait before you can add a new fact becomes so large you are routinely bothered by occurrences where you encounter a fact you wanted to put into your SRS but didn&#x27;t have the bandwidth to.<p>Source: input 35 new vocab a day into Anki while learning Japanese a decade ago and grew my vocab deck to 18000+ cards. Reviews would take several hours a day, and at one point I stopped adding new words to try and wait for the daily review load to go down. When it never did despite this, I just deleted the entire thing and say fuck it.