Task: Instance Description Understanding (ontology: Business_Finance/Financial_Industry_Business_Ontology)

Which of the following definitions best describes the instance 'eighteen months'?

A. explicit period of 24 hours
B. duration of exactly the instance
C. duration of exactly the instance, or 24 hours, such as for an overnight rate
D. duration of exactly the instance, regardless of the length in days of a given calendar month, but typically 30 days

Answer: duration of exactly the instance, regardless of the length in days of a given calendar month, but typically 30 days