I think I understand the reason for your question now - you are not indexing "idle time" and "talk time" directly in ES. You should be able to calculate the "idle time" and "talk time" as scripted fields in Kibana, assuming you can do that based on data from a single document. If your calculation needs to go across document, you might need to use a script as an input to Date Histogram (see example here). Hope this helps!
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