The Archive Retain Time (minutes) is the number of minutes to keep the History Log available for Undo/Redo options selected from the Explorer Tree right click Drop Down list for the following:
Select a number or select 'DeleteOnExit' from the drop down list.
For example, 60 means that Undo/Redo will be available for 60 minutes. The 'DeleteOnExit' will delete the log upon orderly shut-down of IMU Explorer.
Keep in mind that Undo/Redo are no longer available after the Archiving Log Retain files are deleted.