Chinese phrase
最晚什么时候决定？ zuì wǎn shén me shí hòu jué dìng
Meaning
When do you need to decide by?
When to use it
Asks for the latest time a decision must be made. It is a polite way to ask about a deadline.
Example dialogue
这份合同要签字，你们最晚什么时候决定？ zhè fèn hé tóng yào qiān zì nǐ men zuì wǎn shén me shí hòu jué dìng
This contract needs to be signed. When do you need to decide by?
我们会在周五前答复您。 wǒ men huì zài zhōu wǔ qián dá fù nín
We will get back to you by Friday.