Duration may refer to: * The amount of time elapsed between two events * Duration of action, how long a drug produces its effects * Duration (finance) – the weighted average time until the various cash flows from a security, such as a bond, are received * Duration (music) – an amount of time or a particular time interval, often cited as one of the fundamental aspects of music * Duration (philosophy) – a theory of time and consciousness first proposed by Henri Bergson * Duration (project management) – the number of calendar periods for the completion of a project in project management * For duration in phonetics and phonology (the feature of being pronounced longer) see Length (phonetics)

See also