looks as though you are looking at call center data (acd). I had a similar problem displaying call duration for a call center with a .net app. Tryed to replicate the excel function [h]:mm:ss.
here was my solution - not sure if it helps you or not.
Ok...how did you try it? Can you give an example of the data you're using, the function/expression you used to add the items together, and describe how you tried to convert it?
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