length of time

基本解释

Yet, the length of time does not correspond to an observed reality; it could be from five years to fifty years.
然而，这个时间的长度与观测到的现实无法对应起来，它可能是五年，也可能是五十年。
As soon as you get the urge to eat something you need to find something else to do for the next 15 minutes (the length of time it can take to get over an urge).
一旦你有吃东西的冲动，在接下来的15分钟找点别的事情做（时间的长度要能缓过这个冲动劲）。
The duration required to define the work depends on the length of time necessary to discover and document the information, as well as the time required to gain agreement and approval from the client.
需要花费在定义项目工作上的时间取决于了解和文档化这些信息所必需的时间长短，也取决于需要花费在获得客户的同意和认可上的时间长短。

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.
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.
FORBES: Labor Pains