agc28 said:
How can professionals count faster than 20 seconds then? ..are they just extra proficient at throwing cards onto the table in front of them?
I don't know, but it doesn't matter.
Getting your time down isn't the point of getting your time down. Being able to instantaneously recognize high/low/neutral cards is. It's not like you're going to fail miserably if you count a 20-second deck and magically succeed if you count a 19-second deck.
When you can see K-6-2 and immediately think +1 instead of "Hmm, a king is a ten and tens are good so that's -1 and 6's are bad so that's +1 and so the sum of those is 0 and then there's 2 which is neutral, wait, no, it's low, so that's another -1 so 0 plus -1 is -1, oh wait, low is positive so 2 is +1 so the total is +1", you're okay.
A 30-second deck countdown will allow you to play something like 2,000 hands per hour. That's well above anything you'll ever see at the tables (which will range from 50-200 hands per hour) because of the time it takes for the dealer to make decisions and pay out. You want the speed of a 30-second countdown so that you spend your time thinking about what to do at your count, not what the count is.