a half hour

基本解释

In other words, there was no smoking gun found that links moderate cell phone use, defined in the study as under a half hour a day, with brain cancer.
换言之，对于适当使用手机（研究中指使用时间一天不超过半小时）的用户，没有确凿证据可证明使用手机和患脑癌之间存在关系。
After about a half hour of reading and following the text I had the application to the point where I could add products to the database, edit them, and remove them.
在用了半个小时阅读并依照文本之后，我让应用程序处于我可以向数据库添加产品、编辑它们，并且删除它们的程度。
A half hour a day? An hour?
一天半小时，一个小时，也许两个小时。

A tension headache can last from a half hour to a whole week.
The president would spend at least a half hour going over what happened overnight, what the intelligence community was picking up about threats to the country.
总统至少要花半个小时,来了解过去一晚发生的事情，了解情报局选取的,可能威胁国家的信息。
普林斯顿公开课 - 国际座谈会课程节选
and a lot of other people show up and then they... a half hour after that they draw names out.
很多人都会来。半个小时后，他们抽取名字。
实惠的歌舞剧 - SpeakingMax英语口语达人

We're going to facilitate all the screening functions in an eight and a half hour day.
NPR: Airport Security Marked by Hassles