There are hundreds of thousands of pieces of content representing thousands of learning hours which are freely available in repositories all over the world.

在世界各地各个知识宝库，存放几十万件内容，可自由获取，用于数千个小时的学习。

youdao

NOTE: the table is only a reference for learners in non-Chinese speaking countries and self-study time is included in the learning hours.

备注：以上学习时数，包含自学时间，适合非华语地区学习者。

youdao

Business students spend hours and hours learning how to write a business plan.

VOA: special.2009.06.26

Another value for community learning we set up to have office hours, synchronized office hours, with the students and the professor.

学习社群的另一个价值,在于给学生和教授，制定办公时间，有规律的办公时间。

麻省理工公开课 - 媒体、教育、市场课程节选

They clearly missed Hill after learning about four hours before the game they would be without him.

WSJ: Anthony has 28, Knicks beat Pacers to stay alive

Indeed, the average student is studying for fewer hours and learning less than in the past.

ECONOMIST: Many American universities are in financial trouble

We can keep one million students learning beyond regular school hours, when parents work and juvenile crime soars.

CNN: Prepared Text of Clinton's State of the Union speech