TL;DR: Request it at https://www.reddit.com/settings/data-request
It’s only about the CSV files you get, it doesn’t cover e.g. the images you’ve uploaded.
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I requested mine a few days before the protest and I still haven’t received a download link. Not sure if they’re overwhelmed or if they are specifically delaying on this.
I got my export a few days ago (hadn’t been on reddit to notice the notification) so it took just under 15 days to arrive.