I have configured a review session to be at most 15 flashcards or 5 minutes, whichever is shorter. It usually takes 2–3 minutes. Often I do multiple review sess

I have configured a review session to be at most 15 flashcards or 5 minutes, whichever is shorter. It usually takes 2–3 minutes. Often I do multiple review sessions back to back. But I'm only ever committing to 15 cards at a time, regardless of the size of the backlog – that is very manageable.