To get data when you use an "after hours" filter on insights, you must have run a mailbox contents (EWS) data collection for the specific mailboxes for which you want the information.
For information on how to set that up see the UCCS - Analytics Deployment Guide. https://support.quest.com/technical-documents/unified-communications-command-suite-analytics/8.1/deployment-guide
If you use an "after hours" filter in an insight, the following factors apply:
• The time of the message is the local time for the message participant, as determined by the time zone set for the participant in Outlook.
• When a message is received, the receipt time is based on the time zone that the recipient has set in Outlook.
• The work day is as defined in the participant’s Outlook calendar.
• The time when the message was sent or received is set when the data is collected.
Time-of-day and "after hours" data is not collected for Exchange 2007.
For more detailed information on filters have a look at the "Modifying UCCS - Analytics insights" section in the user guide. https://support.quest.com/technical-documents/unified-communications-command-suite-analytics/8.1/user-guide