Can MessageStats report on how quickly mailboxes respond to emails? (4261649)

Can MessageStats report on how quickly mailboxes respond to emails?

In a scenario where customers email a Customer Service department and management wants to see how quickly Customer Service replies. They are currently using for this Mailbox Auditing (sent and Received) and are auditing large number of mailboxes. However because these are 2 different reports it's impossible with the amount of data they have to analyze (>200,000 rows). Even by copying and pasting the reports together there's no easy way in Excel to organize the data in such an order that emails that are part of the same conversation appear on consecutive lines. Is there a better way of reporting on this in MessageStats or are we looking here at an enhancement request? Could there be an enhancement where the 2 reports (Sent and Received) are combined?