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hello to everybody and thanks for reading my post.
my mother tongue isn't english and i have a doubt about the difference between "how far" and "how long", because i had to complete a question: "how ___ is it from here to london?" and i thought that i could say "far" or "long", but in the correction, it said that it only could be "how long is it from here to london?" and i don't understand why it can't be too "how far". i've looked in a bilingual dictionnary and it hasn't sloved anything.
please, i would like to know if both anwers are correct , and why or why it is only correct "how long".
thankyou very much.
Comments  
how far = asking for kilometers (distance)
how long = asking for hours it would take to get there Emotion: time
Anonymous"how ___ is it from here to london?"
"How long" is clearly wrong in this sentence. To use "how long" the sentence would need to be reworded to something like "How long does it take to get from here to London".
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HuevosAnonymous"how ___ is it from here to london?""How long" is clearly wrong in this sentence. To use "how long" the sentence would need to be reworded to something like "How long does it take to get from here to London".
It's not clearly wrong. People say it all the time. When they say it they mean 'How long does it take?' You could call it bad usage but actually, it is flexible usage. And very common. :-)
AnonymousIt's not clearly wrong. People say it all the time. When they say it they mean 'How long does it take?' You could call it bad usage but actually, it is flexible usage. And very common.
It's your answer that's wrong. Native English-speakers do not say it all the time and it is not very common.
We use how far to talk about distance.· How far is our classroom from the washroom? It’s about 30 metres.
We use how long to talk about the amount of time something takes.
· How long is the movie? It’s 2 hours.
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AnonymousWe use how long to talk about the amount of time something takes.
Not always.

How long is her skirt? It is knee-length.
How long are his sleeves?
How long is her hair?