Duration refers to how long memory lasts before it is no longer available.
Short term memories don't last very long.
One way to keep information in the short term memory is through rehearsal. The result of verbal rehearsal is that short term memories are held in the short term memory store, and eventually become long term.
Short term memory has the duration of 3-19 seconds.
Long term memory refers to memories that last anywhere from 2hours to 100years plus anything that isin't short term.
Psychologists have studied the duration of Long term memory and demonstrated that some memories are very long lasting. For example Shepard (1967) tested the duration of long term memory. He showed participants 612 photos, one at a time. An hour later they were shown some of these pictures among a set of others and showed almost perfect…