The Duration calculation is not taking time zone differences into account. It is just doing a time2-time1 difference.
For your consideration, please view the durations for previous flights in the lower right hand corner of the screen:
http://flightaware.com/live/flight/N468TT
The durations look correct to me; which one doesn’t match the stated departure/arrival times?
The departure or arrival time for the most recent flight appears erroneous; probably a late departure message or an early arrival message.
Mark,
If I understand the original question, looking at actual, it shows a 6 minute flight in the below image.
Track log doesn’t match the actual times posted to the right in the above image at flightaware.com/live/flight/N468 … M/tracklog
lieberma, you are correct. I know an Epic is fast, but given the distance involved… 
