I know, quite a worry eh! I have added to the blog a diagram of start and finish points of the cars, by my reckoning anyway. Maybe either if the 2 residents whos cars were hit will know better.
I come out of Loxton with the dogs quite regularly so its a worry for me too. Not uncommon to see cars emerge without stopping though.
As for time frame, your time narrows it down somewhat. I was there about 9.20-9.30 and it was all finished with no owners with the cars anymore, so would guestimate about 9am. By 10am people were back with the cars taking photos.