How to Say “How Often” in Chinese (多长时间……一次)
Chinese asks and answers “how often” with one frame: [Time span] + Verb + [Number]次 (+ Object). To ask, set the span to 多长时间 and the count to 一次 (你多长时间锻炼一次？, “how often do you exercise?”). To answer, fill in a real span and count (我一周锻炼三次, “three times a week”). The time span always comes first, and there’s no word for “per.”
Why this trips learners up
“How often” looks trivial in English, but how to say “how often” in Chinese works through one tidy frame you use both to ask and to answer: [Time span] + Verb + [Number]次 (+ Object). The clever part is that the question and the statement are the same structure. To ask, you set the time span to 多长时间 (“how long a time”) and fix the count at 一次 (“one time”). To answer, you just swap in a real span and a real count. Once you see that, the whole topic collapses into a single pattern.
So the question is literally “how long a time do you do it once”: 你多长时间锻炼一次？ (“how often do you exercise?”), 你多长时间看一次牙医？ (“how often do you see the dentist?”). The 一次 is not optional. Drop it and 你多长时间锻炼 asks something else, “for how long do you exercise,” about duration rather than frequency. That little 一次 is exactly what turns “how long” into “how often.”
To answer, put the time span first, then the verb, then the count with 次: 我一周锻炼三次 (“I exercise three times a week”), 我们公司两周开一次会 (“our company has a meeting every two weeks”), 这种药四个小时吃一次 (“take this medicine every four hours”). Notice there’s no word for “per” or “a”: the bare 一周 (“one week”) does the job of “a week,” and the order is the reverse of English, which puts the count first (“three times a week”). If there’s an object, the 次 can come before it (开一次会), and a coverb like 给 keeps its normal spot: 我一周给爸妈打两次电话 (“I call my parents twice a week”).
One important limit: this frame is for regular habits. Because it literally counts occurrences per time span, it assumes the action happens on some schedule. For a one-off or irregular action it sounds odd, so instead of 你多长时间换一次工作？(as if changing jobs were routine), you ask with 经常 (“often”) or 很少 (“rarely”): 你经常换工作吗？ (“do you change jobs often?”), 你很少吃牛油果吧？ (“you rarely eat avocado, right?”). Save 多长时间…一次 and the 一周…次 answer for things people actually do on a cycle.
The structure
Colour key
Each colour marks one grammatical role — and the same colour means the same role on every page in the Lab.
Examples in context
Real-world sentences, easiest first. Toggle pinyin or the translation, tap any word to see its role, or play the audio.
Tap a word to see its grammatical role.
nǐ 你 Subject duō cháng shíjiān 多长时间 Question duànliàn 锻炼 Verb yī 一 Number cì 次 Pattern
How often do you exercise? (Ask by setting the span to 多长时间 and the count to 一次.)
wǒ 我 Subject yī zhōu 一周 Time duànliàn 锻炼 Verb sān 三 Number cì 次 Pattern
I exercise three times a week. (The answer to the first example: 一周 + Verb + 三次.)
nǐ 你 Subject duō cháng shíjiān 多长时间 Question kàn 看 Verb yī 一 Number cì 次 Pattern yáyī 牙医 Object
How often do you see the dentist? (多长时间 + Verb + 一次, with the object 牙医 after 次.)
wǒmen gōngsī 我们公司 Subject liǎng zhōu 两周 Time kāi 开 Verb yī 一 Number cì 次 Pattern huì 会 Object
Our company has a meeting every two weeks. (两周 + 开 + 一次 + 会; 一次 splits the verb-object 开会.)
zhè zhǒng 这种 Subject yào 药 Subject duō cháng shíjiān 多长时间 Question chī 吃 Verb yī 一 Number cì 次 Pattern
How often do you take this medicine? (多长时间…一次, with 这种药 as the topic.)
wǒ 我 Subject yī zhōu 一周 Time gěi 给 Function word bà mā 爸妈 Object dǎ 打 Verb liǎng 两 Number cì 次 Pattern diànhuà 电话 Object
I call my parents twice a week. (The coverb 给 keeps its spot: 一周 + 给爸妈 + 打 + 两次 + 电话.)
dàrén 大人 Subject yīnggāi 应该 Function word yī nián 一年 Time zuò 做 Verb yī 一 Number cì 次 Pattern tǐjiǎn 体检 Object
Adults should get a checkup once a year. (A modal fits in front: 应该 + 一年 + 做 + 一次 + 体检.)
wǒ de 我的 Subject shǒujī 手机 Subject chàbùduō 差不多 Adverb liǎng tiān 两天 Time chōng 充 Verb yī 一 Number cì 次 Pattern diàn 电 Object
My phone needs charging about every two days. (差不多 hedges the span: 两天 + 充 + 一次 + 电.)
Common mistakes
Why it happens: 多长时间 alone asks “how long,” not “how often.” 你多长时间锻炼？ asks how much time you spend; you need the 一次 to ask about frequency: 你多长时间锻炼一次？. The 一次 is what makes it “how often.”
Why it happens: The time span comes first, then the verb, then the count with 次, the reverse of English “three times a week.” It’s 我一周锻炼三次, not 我锻炼三次一周. And there’s no word for “per”: the bare 一周 already means “a week.”
Why it happens: This frame is only for regular habits. For a one-off or irregular action it sounds odd, so don’t ask 你多长时间换一次工作？ as if changing jobs were scheduled; ask 你经常换工作吗？ with 经常 (“often”) instead.
Compare & contrast
| Asking: 多长时间…一次 (how often?) | Answering: [time span] … [count]次 | The difference |
|---|---|---|
| 你多长时间锻炼一次？nǐ duō cháng shíjiān duànliàn yī cì? = “how often do you exercise?” (the question) | 我一周锻炼三次。wǒ yī zhōu duànliàn sān cì = “I exercise three times a week” (the answer) | 你多长时间锻炼一次？sets the span to 多长时间 and the count to 一次 to ask “how often do you exercise?” 我一周锻炼三次 fills both slots in to answer, “three times a week.” Same frame, question then answer. |
| 你多长时间看一次医生？nǐ duō cháng shíjiān kàn yī cì yīshēng? = “how often do you see a doctor?” | 我一年看一次医生。wǒ yī nián kàn yī cì yīshēng = “I see a doctor once a year” | 你多长时间看一次医生？ (“how often do you see a doctor?”) and 我一年看一次医生 (“I see a doctor once a year”) are the same structure: the question just leaves the span and count blank for the answer to fill. |
Try it yourself
Say “I drink water three times a day.” Use [time span] + Verb + [count]次: 我一天喝三次水。
Related patterns
Quick reference card
How to Say “How Often” in Chinese (多长时间……一次) grammar.merrymandarin.com A pocket summary — print it and keep it by your desk.