Best method to visually show "Case file resolution" time
I have built a report for a call center to track case files time to resolution (created date/time - Resolved date/time). I am having some trouble visually displaying this because there is such a wide range of time to resolution. Specfically there are signific cases in which the case file is resolved in less than 1 hour and there are some that are resolved in hundreads of hours. This creates an issue for displaying "average' time to resolution.
Any ideas on how to better display a visual in this situation? Is there a way to exclude the top 20% and bottom 20% in the calculation to trim off the cases that remain open extremely long times or that are closed in less than X minutes?