I don’t know for how long, but I just used it and it worked.
If you waited to wipe your account until after the protest started (like me) there are likely a bunch of subs that were private, and your comments weren’t deleted. It’s worth checking again to see if there are any comments you missed.
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It should work indefinitely. It doesn’t use the same API that third-party apps were using, it uses the user API that is used to browse the site, basically just using the permissions a logged-in reddit user account uses.