at least through the fall of 2021, according to leaked internal DOD memo from Asst. Sec. of Defense:
"If it’s not possible to sustain at the current level with NG personnel, we need to establish the number of NG personnel (DCNG and out-of-state) we can sustain for an extended period – at least through Fall 2021 – and understand additional options for providing DoD support, to include use of reserve personnel, as well as active component."
National Guard could stay in DC until the Fall, source reveals to FOX 5
https://www.fox5dc.com/news/national-guard-could-stay-in-dc-until-the-fall-source-reveals-to-fox-5
*: Nothing says fraudulent banana republic regime like the image of armed soldiers patrolling the imperial city.