Duration may refer to: * The amount of time elapsed between two events *

Duration of action Pharmacodynamics (PD) is the study of the biochemical and physiologic effects of drugs (especially pharmaceutical drugs). The effects can include those manifested within animals (including humans), microorganisms, or combinations of organisms (fo ...

, how long a drug produces its effects *

Duration (finance) In finance, the duration of a financial asset that consists of fixed cash flows, such as a bond, is the weighted average of the times until those fixed cash flows are received. When the price of an asset is considered as a function of yield, du ...

– the weighted average time until the various cash flows from a security, such as a bond, are received *

Duration (music) In music, duration is an amount of time or how long or short a note, phrase, section, or composition lasts. "''Duration'' is the length of time a pitch, or tone, is sounded." A note may last less than a second, while a symphony may last more ...

– an amount of time or a particular time interval, often cited as one of the fundamental aspects of music *

Duration (philosophy) Duration (French: ''la durée'') is a theory of time and consciousness posited by the French philosopher Henri Bergson. Bergson sought to improve upon inadequacies he perceived in the philosophy of Herbert Spencer, due, he believed, to Spencer's ...

– 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) In phonetics, length or quantity is a feature of sounds that have distinctively extended duration compared with other sounds. There are long vowels as well as long consonants (the latter are often called ''geminates''). Many languages do n ...

See also