odata.stackexchange.com is damn funny. But when are cached(?) query results like this Q get updated?
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The stack exchange data explorer is updated monthly.
You could use a quick query to approximate when the last load happened (as of this post the 8th of January 2011)
When SEDE is updated (other answers cover this), the query cache is dumped, so the first user to run a particular query after the update puts the new results into the cache.