Chinese phrase
〜多久一班？ 〜 duō jiǔ yì bān
Meaning
How often does ___ run?
When to use it
Asks how often a bus, train, or other service runs. It is a neutral way to ask about the time between departures.
Example dialogue
到机场的地铁 多久一班？ dào jī chǎng de dì tiě duō jiǔ yì bān
How often does the subway to the airport run?
高峰期大约每六分钟一班，平常十到十五分钟一班。 gāo fēng qī dà yuē měi liù fēn zhōng yì bān píng cháng shí dào shí wǔ fēn zhōng yì bān
About every six minutes during rush hour, and every ten to fifteen minutes normally.