Chinese phrase
多久见效？ duō jiǔ jiàn xiào
Meaning
How long does it take to see results?
When to use it
This asks when something is expected to start working. It is common when asking about treatments, products, or other processes.
Example dialogue
请问这个面膜多久见效？ qǐng wèn zhè ge miàn mó duō jiǔ jiàn xiào
Excuse me, how long does it take to see results from this face mask?
有的当下就有光泽感，但要看到明显改善通常需要连续使用两到四周。 yǒu de dāng xià jiù yǒu guāng zé gǎn dàn yào kàn dào míng xián gǎi shàn tōng cháng xū yào lián xù shǐ yòng liǎng dào sì zhōu
Some masks give an immediate glow, but noticeable improvement usually takes two to four weeks of continuous use.