How to find the time an attribute was added to a version in Clearcase

I'm trying to figure out how long on average I take to review files at work. The way our review system works, someone checks a new version in and applies a Reviewer attribute to the file with the name of the reviewer. Then after the reviewer finishes the review, they apply an Approved attribute with the value "yes" or "no".

So to find the time it takes for me to review something, I need to find the difference in creation time of the two attributes. Is there a way to find these creation times in clearcase?

I can definitely get the time the version itself was created using cleartool describe, but I didn't see a way to do it for the attributes.

via Chebli Mohamed