My first one-hander was a Delica I got back in '96, I remeber being able to draw that in under a second. I really don't bother with seeing how fast I am any more, having gotten into knives and now carrying a variety of tip up/down, opening hole/variously shaped thumbstuds, big blade/little blade, tight/loose pivot, liner/lockback/axis/rolling/compression locks. Considering the effective range of a knife, the first move for me would have to be performed with a free hand, allowing that .5 to 3 second window to draw the knife. Drawing a knife as a movement in and of itself is a wasted one, as it provides neither offense nor defense in its action. Only once the blade is out and in position can it be useful. Half a second is still slow if done at an inopportune moment. Plus, I've played around with the whole closed blade as an impact tool idea, but I personally don't care for it.