The 24-Hour Log is setup to alert management of records that will be due for review prior to the expiration date. At that time (or any time beforehand) a record can be reviewed and certified by the analyst that there is still a mission need to retain the information. The expiration date will then be set for an additional year out This can go on for as long as the information is deemed necessary for the mission. If a record arrives at its expiration date without being reviewed and approved, the record will automatically be purged from the system.