Update history on a city's page

Now that updates from OSM are ramping back up, it would be cool to see how often updates occur. This would sate the impatient type. And when people as when it’s likely to update (again), others can just point out the history. Of course, from what I understand, it’s not a clear-cut interval, and also has to do with active striders in that city. Anyways, I thought of this elsewhere, but decided to make it an official idea.