Imported Custom Field & Time Calculations


I use EazyBI for Change management and I want to show something that I can’t work out.

As we have overlapping changes, I want to show how much time we spend doing changes per day.

So, we have Requested Window Start (RWS) and Requested Window End (RWE).

These are imported as Measure, Value and Property Changes, no option to import as a Dimension.

So effectively I think I need to add the number of minutes between RWS and RWE, then add these daily, to give the graph. But everything I seem to be able to do is using a count of how many issues have RWS/RWE set, rather than seeing the content of the field?

What am I doing wrong?