Approximate or typical time it takes to work with or through this learning resource for the typical intended target audience, e.g. 'PT30M', 'PT1H25M'.(English)
Books and ebooks does not have durations by virtue of being physical and digital objects. If the item is about multiple editions of a literary work then those should be split into their own seperate items(English)
Ebooks does not have a duration by virtue of being digital objects. If the item is about multiple editions of a literary work then those should be split into their own seperate items(English)
