Duration and Frequency

<Example Sentences>
きのう　いちじかん　べんきょう　を　しました。
I studied for an hour yesterday.
* You simply put "じかん" after each number to describe "for ～ hours".

いっしゅうかん　ずっと　あめ　が　ふっています。
It has been raining for a week.

いっかげつ　しごと　を　やすみました。
I took leave from work for a month.

いちねん　とうきょう　で　はたらきました。
I worked in Tokyo for a year.

いちにち　に　さんかい　は　を　みがきます。
I brush my teeth three times a day.
*Period に Frequency

いっしゅうかん　に　いつか　がっこう　に　いきます。
I go to school five days a week.

いちにち　に　なんじかん　はたらきますか。
How many hours do you work a day?
はちじかん　ぐらい　はたらきます。
I work for about eight hours.

Reference:
Numbers in Japanese
https://anchor.fm/yuya-sato/episodes/Numbers-in-Japanese-emj500

Particles "wo", "de", "ni", and "he"
https://anchor.fm/yuya-sato/episodes/Particles-wo--de--ni--and-he-en1dme

Instagram:
https://www.instagram.com/yuyaman1986