The three-hour class is divided into four blocks of 45 minutes each.

三小时的课分成四节，每节45分钟。

《牛津词典》

I hated spending my Saturdays in a three-hour Chinese class.

我讨厌周六上三小时的中文课。

youdao

Also I had private lessons—the teacher would give me one-to-one class for three hour.

我也有私人课程——老师会给我一对一上三个小时的课。

youdao

It includes everything you need for a one-day BluePrint juice cleanse, plus a three- to four-hour Clearing Factor spa treatment and a private yoga class.

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Students keep their day jobs while attending a three-and-a-half-hour class each week, run by mentors including Evernote CEO Phil Libin and Mint.com founder Aaron Patzer.

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The following day, class continues with a flight session on the three-hour Taste of the Tours.

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