Thanks, Dan! I just expanded it even more (correcting my earlier error confusing the privacy policy and data retention guidelines). See what you think of this:

Since this raw data identifies the location of individual editors, we keep it for only 90 days, in accordance with our data retention guidelines. Data older than 90 days is continuously purged from the source cu_changes table, but since we regenerate the Data Lake's editing data every month, we instead keep data in mediawiki_private_cu_changes and geoeditors_daily for the two latest calendar months (the month of the latest mediawiki_history snapshot and the previous). Older data may be temporarily available before it is purged, but you should not rely on this.

On Tue, 20 Nov 2018 at 12:43, Dan Andreescu <dandreescu@wikimedia.org> wrote:
That's right, Neil, I just changed the language around a bit, thanks for updating that!

On Tue, Nov 20, 2018 at 3:26 PM Neil Patel Quinn <nquinn@wikimedia.org> wrote:
Hey there!

Could someone from Analytics clarify the purging schedule for geoeditors_daily and add it on Wikitech? I've added some information based on my experience using the dataset, but it may not be fully accurate.

I wrote:
Because these tables contain the countries of individual editors, we only keep the data corresponding to the two most recent full months (the month of the latest mediawiki_history snapshot and the previous).
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