It was down for about 3 or 4 days before that announcement from what I recall. Based on when this was posted, its been down for at least 19 days.

My own instance was down for a couple weeks due to some highly unexpected hardware issues, and our sysadmin was out on a business trip so they couldn't bring it back up immediately (though they were keeping us updated on the situation with an alt account), so it's not unheard of to go down for that amount of time, but as the SDF admins don't communicate on lemmy at all, it's hard to know what's going on behind the scenes as to the status of it.