Chinese phrase
开封后能放多久？ kāi fēng hòu néng fàng duō jiǔ
Meaning
How long can it be kept after opening?
When to use it
Asks how long an opened item can be kept. It is a practical question about storage time, often used for food or other products.
Example dialogue
服务员，这个沙拉酱开封后能放多久？ fú wù yuán zhè ge shā lā jiàng kāi fēng hòu néng fàng duō jiǔ
Excuse me, how long can this salad dressing be kept after opening?
这个要冷藏，开封后最好五天内吃完，超过就不建议食用。 zhè ge yào lěng cáng kāi fēng hòu zuì hǎo wǔ tiān nèi chī wán chāo guò jiù bú jiàn yì shí yòng
This should be refrigerated. It is best to finish it within five days of opening; eating it after that is not recommended.