How _____ will it take me toget there It's about twenty minutes' walk

How _____ will it take me toget there It's about twenty minutes' walk
How _____ will it take me toget there It's about twenty minutes' walk

How _____ will it take me toget there It's about twenty minutes' walk
long

how long 用来对某一段时间进行提问，是多久的意思，而对具体的时间，用what time is it？来提问