courseWorkload

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > courseWorkload

The amount of work expected of students taking the course, often provided as a figure per week or per month, and may be broken down by type. For example, "2 hours of lectures, 1 hour of lab work and 3 hours of independent study per week".
Values expected to be one of these types
Text
Used on these types
CourseInstance

Source

https://github.com/schemaorg/schemaorg/issues/1909