B你要去多久？
Good afternoon. How much? How long? How nice! How beautiful! A: Good morning. B: morning.
下午好！多少钱?多久?（多长?） 多漂亮啊！ 多美啊！
B: We need to know how long this product will last in the field.
B：我们需要知道产品在使用中可以有多长的寿命。
B: How long does it take to collect this check?
托收这张支票需要多长时间？
How long would you stay, Sir? B: Two nights.
先生，您准备住多久？两个晚上。
B: How long will you complete a translation as an English editor?
如果您是一名英语编辑，您最快能用多长时间出一本译著？
B: Thank you. How long do you need for approval of my loan?
谢谢，需要多长时间批准我的按揭申请呢？
B: May I know how long I'll have to work a day?
我想知道我一天将工作多长时间？
B: May I know how long I'll have to work a day?
我想知道我一天将工作多长时间？
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