Comment by superobserver

Well, my understanding is that there's a submission then various teams are apprised and given x hours to complete, where x would obviously be greater than twenty-four, and not necessarily handled in one setting, such that there'd be a 'reveal' disclosing successful contestants. So it looks like I wasn't mistaken there.

But that still does not address the matter of rigging and whether Pwn2Own has clear rules against it. I don't know, which is why I asked.