If I'm not mistaken, Hogsmeade in Osaka began work in October of 2012, about nearly 1.5 years before the July opening.
I would assume that Osaka works differently than Orlando, and that they didn't need to remove anything in the process for SNW, so I would assume once it goes up, it will go up fast.
SNW however, has had work done since June, clearing the main path to the land, installing infastructure, and prepping the land for further work to go along more at a faster rate. And it isn't like it's having DK as a part of the land either.