而在美国，高中老师通常上三堂九十分钟(每天四节)或四到五节五十分钟的课程(每天七节)。

In the United States, high school teachers typically teach three 90-minute periods (out of four) or four or five 50-minute periods (out of seven).

youdao

Two hours,you can be on a damn train to New York City and you'll be lucky if you get eighty miles in two hours, or an hour and fifty minutes.

要知道,两个小时都可以做火车去纽约了,但如果是步行,八十公里你一个小时五十分钟,到两个小时内走到就算不错了

耶鲁公开课 - 1871年后的法国课程节选