I fully expect to grow weary of the region formula before I've explored every region, but I still ended up sticking around for longer than I originally had anticipated.
I'm about 20-25 hours in and I think I'm about 1/3 through the game's regions - at least if the remaining ones are about the same size as the ones I've been in so far. Despite the fairly basic and straight-forward gameplay I'm honestly having more fun than I had expected.