The length of time which auditory sensory memories, or echoic memories, can last is as long as:
This refers to the brief storage of information in the brain which makes it an unreliable source of getting information.
With this in mind, we can see that based on the research made by George Sperling, he determined that visual sensory memories were fleeting, but that auditory sensory memories, or echoic memories, last for as long as 3-4 seconds
Read more about sensory memory here:
https://brainly.com/question/1147955