But it honestly depends on the purpose, and the person. There are tunables about how often you see cards in the learning phase, how many new cards are released daily, and how impactful forgetting is on future reviews. Language learning cards focused on vocabulary, may need a longer "learning" stage than math or science topics. So a lot of this comes down to looking at your recall percent, and tuning / reducing new cards added cards to the review set until you are hitting 80-90 percent recall for a week straight. I don't even recall the defaults but especially if you are downloading other people's decks its easy to drown in new cards.
My other suggestion is to use Cloze deletion cards where feasible. It's much easier to learn the US Bill of rights as a set of clauses than trying to recall the seventh amendment on demand in its entirety, and Cloze makes it simple to produce these.
But it honestly depends on the purpose, and the person. There are tunables about how often you see cards in the learning phase, how many new cards are released daily, and how impactful forgetting is on future reviews. Language learning cards focused on vocabulary, may need a longer "learning" stage than math or science topics. So a lot of this comes down to looking at your recall percent, and tuning / reducing new cards added cards to the review set until you are hitting 80-90 percent recall for a week straight. I don't even recall the defaults but especially if you are downloading other people's decks its easy to drown in new cards.
My other suggestion is to use Cloze deletion cards where feasible. It's much easier to learn the US Bill of rights as a set of clauses than trying to recall the seventh amendment on demand in its entirety, and Cloze makes it simple to produce these.