Your rough aim is 30 new cards created per day, but there's no harm in spending 2 hours on one day creating a bunch of cards and then taking a break for a few days. The only thing that can be a little challenging is if you spend 8-10 hours on one day creating tons and tons of flashcards and then study them over the next few weeks. If you do, then some cards are going to feel REALLY unfamiliar due to the huge time delay between when you created them and when you reviewed them. It's not deadly, but it might feel uncomfortable during your first reviews.

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