OK, let me make a stab at this. In English, I might say "Up to where?" if I was asking someone how much he or she wanted, as in how much water should I pour in to your glass, or how high do you want me to build this wall? Technically, it isn't a correct sentence because it has no verb, but you might hear this spoken aloud. For you Italian speakers, am I in the right ballpark here? Is this what it would mean in Italian, also?