3-6-9-12-15-18 countback. If still level then Prizes could and should be shared as it is not likely a play-off would happen. (2 share 1st place = 1st and 2nd place prize credits added together and then shared between the two EQUAL players. Lets say 3 share 3rd place = 3rd place 4th place and 5th placed credits combined then divided by 3 for those 3 EQUAL players. and so on. It makes no sense to simply issue a prize based upon the time factor. Is that fair to someone across the other side of the globe and asleep when the actual event starts. (I know some say it's a ready go event and doesn't take long to fill up - but it has been noted some of them require players to fill up the quota for many hours)
The odds are pretty remote as quite rightly indicated in earlier posts. However, you shouldn't be penalised for finishing in a place lower then your actual score indicates, especially if you are in the wrong place when the event starts.
That is my slant on the unlikely regular occurence.
Keep smiling & Happy Golfin'