They also gave 2 announcements on the forum that the update period for UK and HK would be delayed.

In the end, it started a lot later than it was meant to (8am, rather than 2:30).

If you go by the 3 hour timeframe they estimated, then they've only overrun by less than an hour and a half so far. And the delayed start time also opened the option of doing stuff before they wnet down for maintainence.

Plus, this isn't exactly something small they're doing. There are hundreds of servers, it's a big update in terms of change to content (which takes more effort than just adding new stuff, as you have to change the old as well).

They've even said they'll be giving us compensation due to the issues they've been having.