HubDub Topic questions and the Leaderboard update mechanism

Today a question about the first user past 100K net worth was settled only because it was ancient (5 days old). If it was more recent it would have had to be voided, because more than 1 option would have been possibly correct . It was settled as "someone else" because none of the named users was first.

But I don't know who actually was the first user to 100K. One minute no-one was all that near and the next two of us had crossed the line. I'm just referring here to refreshing the leaderboard page and unlike earlier where the numbers remained the same, this time they had changed. It's possible, and I'd say likely, that pics4d was first past 100K, but we'll never know.

What I'm getting at is that it would be good to have a more structured schedule for leaderboard updates, and also that people who create HubDub-related questions should incorporate the facts of the update mechanism into their design of their questions. A time-stamp on the page would be helpful too, so that screenshots could be used as settlement proof.