http://us.battle.net/hearthstone/en/forum/topic/18706670891
Belcorin
Blizzard Employee
Posts: 34
Hearthstone will be unavailable during server maintenance on Tuesday,
August 18th, at 3:00 AM PDT. We expect maintenance to be finished around
11:00 AM PDT.
Thank you for your patience.
******
8小時的維護，有點可疑，會不會是？