After running an Audit Logs report from Symantec Endpoint Protection Manager (SEPM > Monitors > Logs > Audit), you notice that the report only covers the last sixty days, however you would like the report to cover a greater timespan.
By default, SEPM Audit Logs is set to 60 days.
To extend the Audit Logs retention period, open SEPM > Admin > Servers > [database] > Edit Database Properties > Log Settings and adjust the Audit Log Limit > Expires after x days value.