Board Thread:Support Requests - Getting Technical/@comment-15278555-20131204031214/@comment-452-20140702210328

As CzechOut mentioned earlier in the thread, there is a correlation between activity on the wiki and the frequency of the S:WP cache clears. I'm not sure exactly how it works, but I know that wikis with less traffic and/or editing activity don't update daily like other wikis.

Assuming you're talking about federationlegacy, Special:WantedPages says it was updated "20:13, July 2, 2014", which was less than an hour ago. The exact minute of the update changes daily, but it usually happens in the same hour. (Every now and again, it changes completely)