Aion's 1.9 patch has gotten a lot of press recently, and rightfully so, given the game-changing updates it brings to the table. With the big day officially scheduled for tomorrow, June 2nd, the community team has updated the official site with word on the expected server downtime, which currently stands at eight hours.
The servers will go dark at 4:30am PDT at the start of the process, which works out to an estimated 1.9 launch time of 12:30pm PDT tomorrow. Check out the announcement over at the official site, as well as the patch notes. While you're at it, have a gander at some of our 1.9 coverage to get up to speed on the forthcoming changes.