/**
* The duration of the item (movie, audio recording, event, etc.) in <a
* href='http://en.wikipedia.org/wiki/ISO_8601'>ISO 8601 date format</a>.
*/
@NotNull
public Builder duration(@NotNull Duration.Builder duration) {
putValue("duration", duration.build());
return this;
}
/**
* Approximate or typical time it takes to work with or through this learning resource for the
* typical intended target audience, e.g. 'P30M', 'P1H25M'.
*/
@NotNull
public Builder timeRequired(@NotNull Duration.Builder duration) {
putValue("timeRequired", duration.build());
return this;
}