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[–] doginventer [S] 1 points 0 points (+1|-1) ago 

“Short answer: it depends Long answer: anywhere from weeks to months”

Building Implosion http://www.rbaker.com/press-room.php?id=242&title=building-implosion

How long would it take to rig? - Pilots For 9/11 Truth Forum http://pilotsfor911truth.org/forum/index.php?showtopic=142

9/11 Conspiracy Theories: How long does it take to plan and execute a controlled demolition of a skyscraper? - Quora https://www.quora.com/9-11-Conspiracy-Theories-How-long-does-it-take-to-plan-and-execute-a-controlled-demolition-of-a-skyscraper

[–] 1Iron_Curtain 0 points 1 points (+1|-0) ago 

So, they would have to known in advance.

[–] doginventer [S] 1 points 0 points (+1|-1) ago 

Exactly