Chinese phrase
要换几次？ yào huàn jǐ cì
Meaning
How often should it be replaced?
When to use it
It asks how often something should be replaced. It is a practical question about a regular replacement schedule.
Example dialogue
咖啡机的滤网要换几次？ kā fēi jī de lǜ wǎng yào huàn jǐ cì
How often should the coffee maker's filter be replaced?
大约每两个月换一次，视使用频率而定。 dà yuē měi liǎng gè yuè huàn yí cì shì shǐ yòng pín lǜ ér dìng
About once every two months, depending on how often it is used.