It'll take about three weeks, give or take a day or so.

这要花大约三周时间，出入不过一天左右。

《牛津词典》

Reports usually come out about three weeks after each month ends.

报告通常在每月结束后大约三周发布。

《柯林斯英汉双解大词典》

It takes about three weeks to a month to notice significant changes in your weight due to altering your training program.

由于改变了训练计划，需要大约三周到一个月的时间才能注意到自己体重的明显变化。

youdao

Jane says she does not use any preservative chemicals in her products, so they only last about two or three weeks.

VOA: special.2010.02.17

He went up North from Denmark to a deserted island of the coast of Norway and stayed there for about three weeks.

他从丹麦北部,来到了挪威海岸的一个荒芜的岛上,并在这里呆了三周。

麻省理工公开课 - 固态化学导论课程节选

We have like two months, about three weeks of sun and then it's finished.

我们有两个月，大概三个星期的晴天，然后夏天就结束了。

关于伦敦的天气 - SpeakingMax英语口语达人

About three weeks before my visit, Prokopi had made an official claim for the T. bataar.

NEWYORKER: Bones of Contention

Turner realized he had to officially call an end to things about three weeks ago.

FORBES: Hydra Head Records Founder Aaron Turner On His Label's Demise

The rebound lasted about three weeks (see red box), and formed a very-short-term flag formation.

FORBES: Profit from Flag Formations