这要花大约三周时间，出入不过一天左右。
我曾在一封邮件中提到，我已有三周时间没去探望母亲了。
I mentioned in one that I hadn't visited my mother for three weeks.
例如，一个项目安排计划可能有三个连续的构建迭代，每个六周时间。
For instance, a program schedule might have three consecutive Construction iterations, each six weeks long.
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