Was the camera on or off when that happened?
I have never seen FreeFall > 0.
The turned off camera fell out from the closet in the M6.4 earthquake.
Yeah, I'd definitely only expect it to be recorded for cams that were running at the time of the fall. Mine was probably turning off when it started to fall, so I'm not surprised it wasn't recorded. OTOH, it's possible not all cameras with that XML entry actually record it.
Could
experiment but only expensive cameras seem to have the free-fall entry
The total runtime seems to be seconds, and only updated on boot (that is, if you call the function multiple times without rebooting, it doesn't increase). I'm not totally convinced the values on my cams reflect how much I've used them, most of mine are refurbished and it's not clear if Canon resets those values.
Only on newer cams like M100, G9xII, M50, EOS M6 Mk2, G5X Mark II andere all R"s.
Seems like most DryOS r58 and later have CamInfo_Debug, but not all.