Chinese phrase
可以延长多久？ ké yǐ yán cháng duō jiǔ
Meaning
How long can I extend it for?
When to use it
It asks how much longer something can be extended. It is a polite, practical way to ask about the allowed extension period.
Example dialogue
我的签证快到期了，可以延长多久？ wǒ de qiān zhèng kuài dào qī le ké yǐ yán cháng duō jiǔ
My visa is about to expire. How long can I extend it for?
最多可以延长1年，需要提前2周申请。 zuì duō ké yǐ yán cháng 1 nián xū yào tí qián 2 zhōu shēn qǐng
You can extend it for up to one year. You need to apply at least two weeks in advance.