Imagine you are talking about the distance between two states like NYC and Texas. You are in NYC and don't know what is the precise distance and your friend who you're talking to is aware. You want to ask them. You would probably ask:
- How far is it from here to there?
I guess the bold part is redundant and whereas you are indicating Texas by the pronoun "it", the part "to there" can be omitted without any change in meaning. But My question is that if I guess right and then if saying the sentence in the way it is (without removing "to there" would be considered a mistake or not?