Both can be used for distance.

來源: YuGong 於 2010-12-16 18:02:14 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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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