We've noticed something odd in the monthly average-handling-time for flags on ServerFault. It has gone decidedly up in the last week or so, even though the 'daily' handling times have been sub-hour. Something is up, here.
Our current theory is that when posts that have been flagged a second (or third) time previously gain another flag (perhaps an Off Topic close three months ago earns a please-delete), when that post gets handled again, the handling time of both the previously-handled flag and the new flag gets included into the average. It would explain the inflation we're seeing.