Grammar Info
N4 Lesson 2: 11/17

に (Frequency)
Times (in each time period), Every, Frequency of

Timeframe + + Number of Times
Register Standard
使用域 一般
When the 格助詞(かくじょし) is used, sometimes it has the nuance of ‘frequency’. This means that it can be utilized to describe how often something happens/is done. In this grammatical construction, the ‘time frame’ is followed by , then followed by the number of times that you would like to say that something happens.
In this way, keeps its regular nuance of being a ‘goal’, or ‘destination’, within which something else takes place.
  • 私(わたし)一ヶ月(いっかげつ)一回(いっかい)友達(ともだち)遊園地(ゆうえんち)行(い)
    I go to the amusement park with my friend every month. (One time per month)
  • 彼(かれ)一週間(いっしゅうかん)2回(かい)しか歯(は)磨(みが)かないから、口(くち)臭(くさ)
    Because he only brushes his teeth twice every week, his mouth stinks.
This use of should not be confused with in relation to time. When is used for ‘time’, it is expressing the amount of time that is required to do something, or how much time something is expected to take. It is not used for frequency.
  • 2年間(ねんかん)50万円(まんえん)貯(た)め
    In two years, I saved up ¥500,000. (Natural Japanese, as this expresses the amount of time that something took)
Due to this, you can think of as marking a portion (or portions) of time inside of a larger space of time, within which something happens. However, marks a whole space of time, within which something can be/is completed.
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I take trips abroad about three times in a year.
It is necessary to sleep for six hours every day.
There are ten trains every hour.
Genki II 1st Edition
Page 15
Genki II 2nd Edition
Page 35
みんなの日本語 I
Page 75 [CH 11]