多长

• how long

例句

1. 做这项工作需要多长时间？
   How long will the job take?
2. 你能估计其长度[它有多长]吗？
   Can you estimate its length/how long it is?
3. 安装电话机与总机接通要多长时间？
   How long will the connection of the telephone take? ie How long will it take to install a telephone and connect it to the exchange?
4. 自从我们看望你母亲以来到现在有多长时间了？
   How long is it since we visited your mother?
5. 我回忆不起来多长时间了。
   I can't recall how long it has been.
6. 你能瞪着看多长时间不眨眼？
   How long can you stare without blinking your eyes?
7. 到那儿要多长时间？
   How long will it take me to get there?