The Best Time to Do a Review Is Right After Seeing the Word in a Context

The most effective time to do a review is immediately after I've seen the word in a context. We should never do more than a handful, max 10 flashcards at a city. After a while, we're no longer learning anything and it's becoming tedious. Max 10, preferably 456. Any learning activity, reviewing activity should be as easy as possible. No scratching your brain, no trying to remember.