You should get all your jobs done in the game before patch 2.4 launches on Monday, October 27, 12:00 a.m. The downtime shoul last until October 28, 12:00 a.m. (PDT).
It will last so long because also database optimization will take place in addition to the patch.
But with this patch you can expect new Rogue class, new Ninja job, a lot of new plots of housing land and more. So the waiting should be worth it.