Both can be used for distance.

 

To my personal experiences:

When I asked someone who just came back from running: how long did you run?

Most of the cases he gave me the time (duration), e.g. 50 minutes, he used.

So when I wanted to know the distance, I instead asked him: how far did you go?

 

 

 

 

 

 

 

 

 

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• thank you very much:) -戲雨飛鷹- ♀ (0 bytes) () 12/16/2010 postreply 18:50:18