What most people do not realize is there is not a whole lot of difference between a no-knock and a knock and announce, at that time of night.
It takes a while to respond to banging on the door, when you are already in bed. 45 seconds to a minute does not cut it.
The police say they changed the warrant service, because they did not expect resistance.
Then they broke in her door after 30 seconds of announcing, and maybe 45 seconds to a minute, of banging, at most.
Plus, of course no recording, so we do not know for sure the actual timing. But the officer who was shot, and did most of the banging, estimated 45 seconds to 1 minute. That is probably the top end.