how often meaning in English
多长时间一次
多久；多常
多久一次（对频度副词提问）
Examples
- How often do you hear from your sister ?
你多长时间接到你姐姐一次信？ - How often do you go to church ?
你多少时候去教堂做一次礼拜？ - How often have you been told to confine your curls ?
不是要你经常梳理你的卷发吗？ - How often do you have a bad back ?
你多长时间腰痛一次？ - How often do you go swimming ?
你多久去游泳一次？