对于任一任务的最大持续时间，许多项目经理都有不同的经验，但一般而言，大多数任务都不应超过两周。

Many project managers have different "rules of thumb" for the maximum duration of any one task, but a common one is that most tasks should not exceed two weeks.

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短期(持续时间不到两周)的情绪波动不被认为是这种疾病的特征要素。

Short term mood swings with a duration of less than two weeks are not considered characteristic elements of this disorder.

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杨说这次的冷空气持续时间“史无前例的长”。雨雪天气从1月10日开始在中国的部分地区已经持续了两周。

Yang said the cold spell had been "unprecedentedly long". The rain and snow started in many parts of China on January 10 and have lasted for two weeks.

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