The only real slow importer at this point is the one for UBB.classic when there are a large number of posts since it has to chug through so many flat files.
Any importer that we have that grabs it's data from a database is much faster, so you'd be looking at hours, not days
Plus, since you're on a dedicated, you can adjust the number of posts/users/topics it handles per refresh. The default is only around 20, since we have to play nicely with shared servers.
