The Time Lord & hang-time, dunks, blocks & rebounds - how time is on his side

I promised (or threatened) my readers that I would be using and abusing Rob Williams Time Lord moniker. So here we go. I am always curious. Beyond height, length, leaping ability and athleticism, how does time affect a player's blocks, dunks and rebounds?

When a basketball player leaps for a block, rebound or dunk, he spends well-over half of his air time at the top-half of the leap - 71% of the time, to be exact (per wired.com's Aatish Bhatia):

WHENEVER YOU JUMP, YOU SPEND 71 PERCENT OF YOUR TIME IN THE TOP HALF OF THE JUMP. THIS HELPS CREATE THE FLOATING ILLUSION OF HANGTIME.

You might expect that when you jump, you spend equal amounts of time in the top and the bottom half of your jump.

But…