1·How long will the flight take?
此次航班将飞行多长时间?
—— 《牛津词典》
2·How long has he held office?
他任职有多久了?
—— 《牛津词典》
3·How long is the River Nile?
尼罗河有多长?
—— 《牛津词典》
4·How long is it to lunch?
离吃午饭还有多久?
—— 《牛津词典》
5·How long a stay did you have in mind?
你原打算待多长时间?
—— 《牛津词典》
6·How long is the tunnel?
这隧道有多长?
—— 《柯林斯英汉双解大词典》
7·You sly old devil! How long have you known?
你这个老滑头!你知道有多久了?
—— 《牛津词典》
8·What do I think about it? How long have you got?
我是怎么想的?说来话长,你有工夫听吗?
—— 《牛津词典》
9·How long have you had digital?
你们有数字电视多长时间了?
—— 《牛津词典》
10·How long have you been married?
你结婚多长时间了?
—— 《牛津词典》