If you refresh with the "3 days back" setting, you usually can see any significant break in the time of last post for the threads that come up - if you do it soon after a break. If you wait too long, threads that were "left behind" may have another post, and will be brought forward so that the break is somewhat obscured, or the break will perhaps look longer than it really was.

I found at least two fairly long "down times" over the weekend and today, and I believe Max said in one of the threads a few days ago that it would be necessary to have some interruption in order to update the search indexing. The cat has become large enough that he's been indexing "in pieces," and the "synch" between the parts was a bit mangled so he suggested that he'd shut down to do it all in one pass.

(But I haven't thought of a tough enough search to see if he's improved that particular feature.)

John