10-25 feet seems reasonable with 25 being the upper bound of reasonability. The average person can move 9-12ft/s in a single direction; starting speed would be slower so generous is 5-6ft/s. 2 seconds worth of distance sounds reasonable to keep everyone safe.
As others have pointed out the issue likely isn't the distance. It's that police can enforce their own measures here without accountability.
As others have pointed out the issue likely isn't the distance. It's that police can enforce their own measures here without accountability.