需要几天用英语怎么说

"How many days do you need?" is the most common way to ask how many days someone needs in English.

来源：

这是一个常见的口语表达方式。

英文例句：

How many days do you need to finish the project?
I need at least three days to prepare for the presentation.

中文翻译：

你需要几天才能完成这个项目？
我至少需要三天来准备这个演讲。