The typical learning time or duration of the course

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The requirement that it must be possible to identify the typical learning time of a course comes from the use case of someone wanting to refine a search according to the amount of time required to complete the course.

Note: The time to complete a course has two aspects: (1) the duration, or time elapsed between the start and end of the course; (2) the total amount of time required to work through the course material. For example, a course starting in January and ending in July which requires 3 hours work per week, will have a duration of 6 months / 26 weeks and requires approximately 78 hours work to complete. The same course could conceivably be offered in a "compact" or "accelerated" format in 1 month with ~20 hours per week.

Proposal

The duration of a Course Instance (i.e. the interval between start and end date) can be specified by using the duration property inherited from Event.

The time required to complete a Course can be specified using the timeRequired property inherited from Creative Work.

Examples

Example 1. Describing one offering of an online course.

Based on Coursera Data Scientist's Toolbox Code example 


PRE-MARKUP:
[Course]:
    name: The Data Scientist's Toolbox
    timeRequired: PT15H
    timeRequired [Duration]:
        description: 1-4 hours/week
    hasCourseInstance [CourseInstance]:
        startDate: February 15
        endDate: March 21
        duration: P6W

MICRODATA:
<!--TODO-->

RDFA:
<body vocab="http://schema.org/">
<!-- A MOOC / free online course. As a simple one-off course -->
<!-- Based on https://www.coursera.org/course/datascitoolbox -->

<main typeof="Course">
  <h1 property="name">The Data Scientist's Toolbox</h1>

  <h2  >About this Course</h2>
  <div property="timeRequired" typeof="Duration">
    <span property="description">1-4 hours/week</span>
  </div>
  <meta property="timeRequired" content="PT15H" />
  <div rel="hasCourseInstance" typeof="CourseInstance">
    <h3 ><span property="startDate">February 15</span>
         <span > - </span><span property="endDate">March 21</span></h3>
    <meta property="duration" content="P6W" />
  </div>
</main></body>


JSON:
<!--TODO-->
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