A while. It's a PITA going through all that stuff. Tech may have advanced since I retired. We also had a policy that staff can't just surf all the video/audio just to snoop without a complaint or other compelling reason. Keeps asshole left supervisors from targeting people. I had one that did that shit and had to slap him down but I hear he's back to his old tricks…How long would it take to find the Scheffler footage at the end of the day if the officer had turned on his bodycam?In my experience recordings quash a complaint 99% of the tim. I've had to watch a lot of them and decide.
Camera battery wouldn't last long enough to do those things. Also everything has to be downloaded every day and it'd an enormous amount of data and time to find anything. Most agencies also have cameras in the car that come pre-record 30 seconds and then keep that film when the overheads are activated.