Given the announcement up top, I'd say in about two hours?
That just says 'maintenance', not 'patch maintenance'. So no patch.
My mistake. I had logged in just a few minutes before to craft something and saw a notice about going down at a really odd time. Didn't even realize it was for EU only, anyway.
The fun part is being a console player. We get sit on the sidelines as PC gets their incremental just before consoles get the major update. And still, when consoles get the update it's got the same bug PC had with their update. Then it's our turn to wait a couple more weeks for the same incremental.