Quite simply, the time it takes for a sound to occur from beginning to end.
We can also speak of the duration of particular parts of a sound's envelope such as onset duration or decay duration. Duration is measured in minutes, seconds, or some division thereof.
|With respect to pitch a minimum duration of about 12-15 milliseconds is required for a tone (at 1000 Hz)to be heard as a tone at all. If the duration of the tone is any shorter the resulting sensation will be of a "click" without a recognizable pitch. This minimum duration is inversely proportional to the frequency. The higher the frequency, the more cycles in a given duration, the easier it is to perceive a pitch versus a "click".||In the case of loudness, beginning at about half a second (500 ms) the perceived loudness of a tone will decrease as the duration of the tone decreases.|