>

A couple of weeks. 
Keep in mind though that in that time, the cops were fired, the DA started the process to charger them with murder and their unit was disbanded. 
The protests were a desire for accountability. Accountability was already happening when the video was released.
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I haven't really kept up with this story, but as I understand it there are 2 big differences here.
First is a matter of timing. Most COVID lockdowns are done, so while Floyd's death happened at a time where a lot of people had a lot of time on their hands, Nichol's death happened when people are mostly busy with work.
Second, (if I am getting the facts correct here), the officers involved in Nichol's death were arrested before the story got large coverage, which means there is less to protest about. >

Exactly. Much of the Floyd protests were due to the fact that the cops tired to sweep it under the rug, calling his death a “medical event” in official communication. It wasn’t until a teenager released her personal recording that we realized what happened and saw the attempt to cover it up. 
Contrast this event, where there was no cover up and the police force acted swiftly to deal with the problematic cops. The video was released by the police themselves after disciplinary action was already taken. 
This event is the system for punishing bad police working as it should. >

How long until that video was released?