Originally Posted by
Viridiana
Twelve seconds, absolute maximum, and that's assuming you don't get the attack from behind. Nine seconds is the maximum if you're properly executing the attack from behind, and that's also assuming that you apply right after the global tick so that it takes a full 3 seconds for the first tick. More realistically, somewhere between 6 and 9 seconds is the time it takes for Demo to beat Snap.
Oddly, some people seem to think this means you should replace all your Snap punches with Demo, though. That's a horrible idea, and they should be ashamed. >_>