It is the period of time for which a telephone contact between two parties is established, or during which information is transferred.
Merriam-Webster Online Dictionary
duration (noun)1.
continuance in time
2.
the time during which something exists or lasts
Duration (Wikipedia)
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Duration may refer to:
- The amount of elapsed time between two events
- 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
- Bond duration – the weighted average time until the various cash flows from a bond are received