Just a curious question. How fast is it possible to count down one deck of cards? I remember reading about several authors that claimed they could do it in 11 seconds, but is this just as fast as it gets? At first I found this to be incredible but after practicing this drill for an hour everyday (with 2-4 decks, and occasionally with one) I have gotten myself down to 13 seconds for one deck, 28 for 2, and 57 for 4. But I only flip over one card at a time, is this the fastest I can get while only flipping over one card? Is there an efficient way to flip over multiple cards at once without them flying all over the place? Thanks.
P.S. I know being able to count down a deck fast doesn't determine how good a counter you are, so this is just a curious question.

