Tracking time for Pull Request to first review

I like to track the time is takes for PRs in our repo to be reviewed. There is a tendancy to delay PR reviews and I like to expose the time that it takes. (was thinking to track PR creation to first comment posted). 

I have to admit that I am not a heavy user of github myself. Thanks for help in advance. 

Are you looking to write something that makes use of the GitHub API to do your tracking?  If so, this post is a great place to start.

I was hoping for a solution that’s ready to use. But thanks for the link.

Hi CC, I am looking to expose the same statistics as the OP.  I looked through the REST API’s related to reviews, but the responses payloads, while ordered chronologically, do not appear to include the review timestamps.  Without that, how would one compute the time-to-review?