How long have you been living in this country?
你在這個國家居住多久啦？
How long can a human being go without sleep?
人不睡覺能活多久？
How long have you been in your present job?
你干現(xiàn)在這工作多長時間了？
Time how long it takes you to answer the questions.
記一下自己回答這些問題所需的時間。