Average Incident Handle Time Per Agent

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I am trying to create a report in Report Explorer that indicates how long an agent took to respond to an incident email. This would be from the time the incident email is opened to the when the Save on Send is clicked and the incident is Saved and Closed. Is there an out of the box report for this? Eddie Bauer needs to track the average handle time per department and per agent. We need to track this data by day, week and month. Please keep in mind that I am a novice to Oracle and may have over