If anything, a 5 minute time period would increase the amount of accidental invalidations because people would alert someone to a mistake, and there's a dramatically higher chance of the person not getting it in time, and editing it anyway.
I definitely agree that a five minute time period would cause even more invalidations; a smaller window has the potential to be even worse than no window (which is still worse than the status quo). I also think that Senator Napoleon has raised a legitimate issue concerning Atlasian elections and want to remind everyone that this is not the first time this has been an issue (Invaligate, for instance). That said, while I am happy to discuss possible solutions to this problem, I would argue that prohibiting Atlasians from editing their votes is truly a cure worse than the disease. Thus, I am sorry to say that I cannot vote for this bill, although I hope that it will provide us with an opportunity to have a constructive debate on how to address this issue (assuming it can be fixed without creating even worse problems, something that I am undecided about).