Thread:User talk:Aaron Schulz/FlaggedRevs Extension/reply

Hello Aaron, I am riding on the same title with a question unrelated to the original question, but to FR nonetheless.

The page review statistic page of Flagged Revisions lists "the average wait for edits by users that have not logged in to be reviewed is x; the median is y."

How is this calculated exactly? What is the time period or review data that are taken into account? I have noticed that the information is not updated very often, so the time frame must be either several days at least, or maybe from the start. Could you please point me to a page where I could get the necessary information on this?