You make it sound they spend months cutting beams.
Mick there was nothing to cut... the steel structures totally disintegrated.
and 70% turned into dust, mostly micron size
[edit by Mick:] See a better discussion on this topic here: https://www.metabunk.org/threads/wtc-rate-of-fall-rate-of-crush.1142/page-5#post-26504
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