I've always been curious how a new bourbon distillery could even come up with a recipe. I mean, just with cooking when I work with something new, it usually takes me 4 or 5 iterations to perfect it. If you age at 4 years just for your test, that would take you 16-20 years just to perfect your recipe.
That's when you are going for something very specific. I would imagine with distilled and aged spirits it gets even more complicated, and it would take even more tries to get it right. I could see it taking a lifetime to perfect your recipe.