Portrait Dialogue: What is the difference between Duration time and Process time?

In Portrait Dialogue Version 6.1, within the Operation History Browser
  1. Duration time: “Duration” is the time from when the operation execution task is created until the execution ends
  2. Process time: “Process time” is the sum of time used by all the chunks in the execution. 
In the screenshot below, the Duration Time is less than the Process Time.

The reason for this is that with chunking and multi-threading, separate threads process chunks simultaneously. So if an operation has 5 threads and each thread processes chunks for 2 minutes, the process time would be 10 minutes, but it would all be completed in 2 minutes (Duration).
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UPDATED:  April 5, 2017