How long before we find out they planned this in Facebook groups, that those groups were lousy with Russian propagandists, that the Trump admin knew this would happen, that they told the Capitol police to let them in, that the national guard was prevented from coming.

Planned on Facebook, check.
https://www.nytimes.com/2021/01/06/technology/violence-election-capitol-hill-social-media.html

Capitol Police let them in, check. https://twitter.com/shannonmstirone/status/1346945238753951748

The National Guard was initially told not to come, check. https://twitter.com/byaaroncdavis/status/1346908166030766080

The Trump administration was in direct contact with the insurrectionists, check. https://twitter.com/Acosta/status/1346927966144655362

Pretty safe to assume that the Facebook groups were lousy with Russian propagandists. https://wtop.com/j-j-green-national/2020/12/democracy-under-duress-russian-disinformation-dark-money-and-deceit/

So the answer to my original question: less than an hour.