Chinese phrase
考试〜多长时间？ kǎo shì 〜 duō cháng shí jiān
Meaning
How long will the exam ___?
When to use it
Asks how long an exam will last. It is a neutral way to ask about the exam's expected duration.
Example dialogue
这门考试从上午九点开始，多长时间？ zhè mén kǎo shì cóng shàng wǔ jiú diǎn kāi shǐ duō cháng shí jiān
This exam starts at 9 a.m. How long will it last?
预计两个半小时。 yù jì liǎng gè bàn xiǎo shí
It is expected to last two and a half hours.