I agree with you MrFreeze. I don't know when they did it all. I just know it was controlled demolition. Leave the main towers aside, and just look at Building 7. Silverstein admitted he gave the order to pull the building. When did they wire it? Did you know that the 20th floor of Building 7 was the billion-dollar "Emergency Bunker" for Rudolph Giuliani, that he never used on the very day for which it was intended? I would conclude it was the command center for the whole operation.
Do you know about the woman, whose firefighter husband was killed in the collapse, who confronted Giuliani and wanted to know how he knew the south tower was going to collapse 10 minutes before it did? NO steel building had ever collapsed before, so this was a valid question. Giuliani just looked at her like the cat who swallowed the canary and walked away. This is all on video if you search for it.
Did you know about William Rodriguez, who was critically injured by a blast in the basement of the north tower before the first plane even hit it?
Did you know that the Secret Service and the CIA had offices in Building 7? Did you know they had the whole thing broom swept within a couple of days?
I could go on and on with things you can never refute, but you can try.