R-Rated
Remember to Have Fun! - Solar Bear 2020 Champion
A GoPro can record 8 hours at 2.7k on 256GB card. If I live the whole 8 hours, just delete the footage and ready to record some more.Anything you film or say can and will be used against you.
Filming all the time would require huge amounts of memory and external power source. My camera, for example, takes only ~3h worth of memory card, and the batteries I have won't support the camera even that long. For a moment I figured, maybe you're talking about running the camera in loop mode, that gopros have. But you wouldn't have anyone to press the button, after the crash.
Looping can be set at 1080 for 20 minute loops.
As far as external power sources, that is not a big deal really. It does not take much time to plug one up.
The ultimate unblinking witness is a 360 mounted where it can see behind me too. It can be plugged in to a USB port for power.