how ----- were you away from tianjin last year?often far lon

How long were you away from tianjin last year?是对的.
你去年离开天津（不在天津）多长时间?
how long 多长时间
how often 多长时间一次,是问频率的
how far 多远,是问距离的
how many times 多少次
用这单个词意思都不通顺.
再问： 哪个是离开呢？be away from 么？
再答： 是的，be away from 是“离开某地”的意思。