On e.g., https://meta.miraheze.org/wiki/Special:ManageWiki/settings#mw-section-edit
RecentChanges max age 15552000 Items in the recentchanges table are periodically purged; entries older than this many seconds will go. Active User Days 30 The number of days within which a person must make edits to be considered an "active" user. Restriction Types Edit Move Create Upload Delete Protect Actions that can be restricted. RecentChanges link days 1 3 7 14 30 180 List days options to list in the Special:Recentchanges and Special:Recentchangeslinked pages.
- The two Recentchanges sections are separated by a non-Recentchanges section. They should be joined.
- The first Recentchanges section uses units: seconds. The second Recentchanges section uses units: days. They should use the same units, days. Or at least the form should help them compute that
$ expr 15552000 / 60 / 60 / 24 180