They aren't that fast. It seems to depend on the console. :s I guess it is usually a ~4 month turnaround but they seem to take a lot longer when there are a lot of cutscenes to voice. (Days and Re:Coded were really quick because there are so few voiced scenes--the majority of the cutscenes just needed to be translated.) The only very voiced game that didn't take forever was KH2 and I think they fast-tracked that because nothing else was in their release window and it was a main game rather than a side game. :/
Oh well, still importing even if there only ends up being a 3-4 month buffer between release and localization.