Not directed at you, BB, but someone is fullashit.

"NIST estimated the elapsed times for the first exterior panels to strike the ground after the collapse initiated in each of the towers to be approximately 11 seconds for WTC 1 and approximately 9 seconds for WTC 2. These elapsed times were based on: (1) precise timing of the initiation of collapse from video evidence, and (2) ground motion (seismic) signals recorded at Palisades, N.Y., that also were precisely time-calibrated for wave transmission times from lower Manhattan (see NCSTAR 1-5A)."

And below, from the site you linked:

Each of the Twin Towers totally collapsed in an interval of approximately 14 to 16 seconds. A temporal record of the entire North Tower collapse is provided by the real-time CNN broadcast feed aired during the attack. (This table shows frames from that video at half-second intervals.) It allows reasonably accurate measurement of gross collapse features such as the growth and descent rate of the rubble and dust cloud. However, this and other video evidence does not allow the determination of a precise time of total collapse because each tower's destruction remains hidden behind an expanding dust cloud which, because of its size, reaches the ground over a span of several seconds.

Despite the availability of video evidence establishing lower bounds of total collapse times of over 13 seconds for each of the towers, assertions that they collapsed in under ten seconds are widespread