Reply #45: 99.5 seconds

[Make7]

From the article in the original post:

Jim Hoffman, a professional scientist published in several peer-reviewed scientific journals, took a long look at all of this. He calculated that even if the structure itself offered no resistance — that is to say, even if the 110 floors of each tower were hovering in mid-air — the "pancake" theory would still have taken a minimum of 15.5 seconds to reach the ground. So, even if the building essentially didn't exist — if it provided no resistance at all to the collapse — just the floors hitting each other and causing each other to decelerate would've taken 15.5 seconds to reach the ground.

http://www.garlicandgrass.org/issue6/Dave_Heller.cfm

Why is his estimate so much shorter than yours? Perhaps you should recheck your math.

-Make7