Creating a Proofing Activities Report

An end user is requesting a report to pull data to understand when a proof is routed, the time between an approver (stakeholder) to open the proof and make a decision on that proof. I am able to create a report that is more generalized to see the time between a proof starting and completing, but they are requesting to see more granular data for each stakeholder on the proof of when they open it to when they make a decision. On top of that, is there a way to then group it by versions as most routes have multiple versions?