镶齿冠需要多长时间？

How long does it take to have crowns fitted?

《柯林斯英汉双解大词典》

我会麻醉多长时间？

How long will I be under the anaesthetic ?

《牛津词典》

他使用了很多长词。

He uses a lot of long words.

《牛津词典》

Said a different way, in the case of the straight-line programs, how long would it take to run a program?

换种说法，在直线式程序里面，运行一个程序要多长时间？

麻省理工公开课 - 计算机科学及编程导论课程节选

One of the things you could imagine is just try it on and input, see how long it takes.

你们想出来的方法只是可能就是通过,输入来试试，看运行时间会有多长。

麻省理工公开课 - 计算机科学及编程导论课程节选

Perhaps it's clear to you that no matter how your axes are oriented, when you ask, "How long is this arrow?"

这应该是比较显然的,无论坐标轴指向哪里,当你问,"这个矢量有多长"

耶鲁公开课 - 基础物理课程节选