Chitts and Heathrow Harry, we went through periods like this on WOE ages ago and I think we reached a more-or-less consensus that, in the event of the challenger not confirming what appeared to be a correct answer, things would move on with Open House being declared. Even if there was some doubt, the lack of response from a challenger shouldn't be grounds for holding up the fun.
Wrt Mae Hong Son, SMOKEON nailed it within 23 minutes and we're now three days on....