需要多长时间才能取得资格？

How long does it take to qualify?

《牛津词典》

你父亲要多长时间才能康复？

How long will it take before your father recovers from his illness?

youdao

如果你定期复习的话，你要花多长时间才能轻松记住这些材料？

How long may it take you to remember the material easily if you review it regularly?

youdao

As time increases, the angle increases and we can ask, "How long does it take for the particle to come back to the starting point?"

这个角度随着时间在增加,我们会问,"质点需要多长时间,才能转到起点"

耶鲁公开课 - 基础物理课程节选

But I don't really know about how long it would take people to hack, like, the general firewall

但我不知道人们具体要用多长时间才能穿过防火墙，

理想是当密码专家 - SpeakingMax英语口语达人