As you know, today will be the maintenance for the Merge.
It will start in about 2 Hours and the minimum downtime is going to be 2 Hours for both Servers aswell since all the accounts have to be transfered.
Keep in mind to Spend all your TP (TP Rings too!) and MP on SG2Global before the Merge as they will not be transfered! [Spending them on S1 is not neccessary.]