Currently the helpdesk reporting system can easily measure the average time till the first agent response. This is a built in, core stat.
An additional stat on average response time for 'every agent response' in a ticket could be a useful addition.
Thoughts from the Deskpro support team: This concept could be complex to actually implement, as support tickets will rarely follow a completely perfect back and forth pattern. If a query like this could be built, it would need to ensure it only calculates the time differences between the a first user message, and first agent response during each interaction in the ticket. This would need to account for circumstances where multiple agents respond consecutively - or an end user sends multiple messages.
There would need to be thought over workflows which may involve internal notes or re-assignment/escalations or pending statuses - circumstances where tickets may be actioned by an agent, but not necessarily responded to.