Collaborator Review Time Tracking Metric Accuracy

Currently the time spent on a review is accrued by the following:

"The license will remain assigned to the user for as long as there is a Collaborator tab open in the browser.
The license will be returned to the pool once all Collaborator tabs are closed, and one hour has passed."

This leads to inaccurately high review times if a user leaves the Collaborator review open in an inactive tab. These inflated review times incorrectly skew the time-based metrics, almost rendering them useless. One idea to combat this would be to have an inactivity timer built in to the review to make sure time is calculated as accurately as possible.