How long does it take for police 'presence' to clear when they are alerted?
Solution 1:
There is visual information on the HUD - it's to the left of the mini map and is represented by badges. The police AI in Cyberpunk 2077 is somewhat poor so the police will not chase you or follow you too far from where you found them. Additionally, police will literally spawn in around where the crime happened.
To avoid the police simply move a couple of blocks away.