User blog comment:Serza5/One Vocaloid, 5 Languages?/@comment-5035488-20140823023440/@comment-3076833-20140824162401

That is, indeed one of the many risks behind doing such a thing. Of course you get languages like Japanese where the recording doesn't take that long but then you get the likes of English where recording takes months, then there's all the production time on top of that. Not to mention the money invested in such a thing will be grand. Of course this is assuming it must be a brand new Vocaloid; we have plenty of multilingual Vocaloids out already and there's nothing stopping them from having new languages, besides the time and risk (unless of course you are Crypton Future Media and would do it anyway).