I don’t feel Larian’s level design works that way. I guess we could see the Grymforge area in Early Access as a kind of dungeon, for example, but it’s one big map. It does have different elevations and I guess I could try to translate it into an n-level old style dungeon if I tried, but that’s not really how it strikes me.
We could perhaps try to guess how many dungeon equivalents there will be, but we’d probably have to start by calibrating what that actually means in BG3 by establishing what areas of EA could be considered “dungeons” and how we count their levels …