He was disgusted at the length of time he had to wait.

他非常讨厌要等那么长时间。

《牛津词典》

Companies have been stymied by the length of time it takes to reach an agreement.

数个公司因耗费很长时间以达成协议而受到阻碍。

《柯林斯英汉双解大词典》

Many have been surprised at the length of time it has taken him to make up his mind.

很多人都为他用这么长的时间才下定决心感到吃惊。

《柯林斯英汉双解大词典》

How quickly this can happen depends on the length of time a person is breathing the gas and the amount of the gas he or she breathes in.

VOA: special.2010.02.02

Well, if this thing is going to vibrate for any length of time it better be a standing wave.

好的，如果它在任意时间振动,那它就是驻波。

麻省理工公开课 - 固态化学导论课程节选

How long" can be used in a question and it refers to a length of time or a length of distance.

How long” 句型用于问句中，用来询问时间或距离的长短。

How long课堂 - SpeakingMax英语口语达人

The length of time seeking new employment has not been seen since the Great Depression.

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Actually the length of time that your SSD runs is completely dependent on the workload.

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He also took into account the length of time the defamatory material appeared online.

BBC: Judge rules three were defamed on Facebook