By default, the recent items list is deleted once in every 15 days. But you can improve ServiceDeskPlus-MSP’s performance by increasing the cleanup frequency.
Example: If you want to cleanup the Recent Item list every 5 days, then use the query,
update GlobalConfig set PARAMVALUE=5 where CATEGORY=’CLEANUP_TASK’ and PARAMETER=’CLEANUP_RI_LIMIT’;
The maximum limit for cleaning up recent item list is 90. If you want to disable the cleanup, then set the parameter value as -1.