I've wondered too if the open date was available. I implemented a weekly report of open files in a previous simple SCCS-based system. In my case the answer to the "So what?" question was that if the files were left too long they forgot what the heck they were doing and threw it away. Presumably a certain amount of useful work was being lost, or as a minimum there were binaries out there in production use that could not be duplicated. The report was free, easy and appreciated, so "Why not?" :-)