The courses last for four, six or eight weeks.

这个课程将有四个，六个或八个星期。

youdao

For six or eight hours spread over the next few weeks I struggled to get the first test written and running.

几周的时间里，我总共花了6到8个小时来编写第一个测试并使之运行。

youdao

Encourage him or her to stay in treatment, or to seek different treatment if no improvement occurs after six to eight weeks.

鼓励他坚持治疗，或寻找别的治疗途径，如果6-8周后疗效没有出现。

youdao

The thought of going away for six or seven or eight weeks or even three months without my kids - I just didn't fancy it anymore.

BBC: Langer defends Trescothick stance

"Lagers can take up to six to eight weeks, or longer, " says Moonlight's Hunt.

FORBES: Czech Mate

The clinics can be either one-to-one or group consultation based and run over a period of between six and eight weeks.

BBC: Firms offered stop smoking clinic