Here is the average cost and duration for each of the top 10 courses or degrees for librarians:

1. Master of Library Science (MLS) – The cost varies depending on the institution and location, but on average, the cost is between $15,000 to $35,000. The duration is usually 2 years.

2. Master of Science in Information (MSI) – The average cost is between $20,000 to $40,000, and the duration is 2 years.

3. Master of Education in Library Media – The cost is between $15,000 to $35,000, and the duration is 2 years.

4. Master of Arts in Library and Information Studies – The cost is between $15,000 to $35,000, and the duration is 2 years.

5. Doctor of Philosophy in Library and Information Science – The cost is between $30,000 to $60,000, and the duration is 4 to 5 years.

6. Master of Science in Information Studies – The cost is between $20,000 to $40,000, and the duration is 2 years.

7. Master of Information Studies – The cost is between $20,000 to $40,000, and the duration is 2 years.

8. Master of Library and Information Studies – The cost is between $15,000 to $35,000, and the duration is 2 years.

9. Bachelor of Science in Library Science – The cost is between $10,000 to $30,000, and the duration is 4 years.

10. Master of Information and Data Science – The cost is between $20,000 to $40,000, and the duration is 2 years.

It is important to note that these are average costs and may vary depending on the institution and location.

Sources:

CollegeBoard (https://www.collegeboard.org/)U.S. News & World Report (https://www.usnews.com/education/online-education)