Net matured spaced repetition cards
I think that this metric is pretty central to thinking about what volume of spaced repetition cards is achievable. Though I’m not sure that 21 days is the best metric (I’m using the matured and learned cards add on to determine this: https://ankiweb.net/shared/info/266436365)
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For the last month, I have been Net matured spaced repetition cards cards at about 3.3 per day. and learning cards at 2.9 per day. I happened to average adding 1 card per day over the last month. While my review times were all over the place, the were trending slightly down below the 15-20 min max I want to have for a lifetime commitment (I think my ideal might be 10 minutes: How long should you study spaced repetition every day?).