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I'm looking at JLPT4/5 grammar list and see such grammar point. But I can't
find any information about it (truthfully I don't know how to).

Though I found some examples: 1 shuukan ni ikkai - once a week 1 nen ni 3 kai
- 3 times a year

Can someone explain this or point me to where I can get that information?
Thanks.
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2013-09-05T23:05:40.770
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2013-09-05T23:13:40.003
3924
question
grammar
Period + に + frequency
Are you asking for help on the pattern, or just other explanations and
materials? Because there's not much to it really. You know that `に` has
multiple meanings, including "in" or "within". So it's a pretty straight
translation.

<Period> + に + <frequency> → "Within <period>, <frequency> times." or
"<frequency> times in <Period>"

>   * １年に３回 → 3 times within 1 year
>   * 一週間に１回 → Once per week
>
CC BY-SA 3.0
2013-09-05T23:13:40.003
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2013-09-05T23:13:40.003
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answer