Shoutbox

I would like to see a feature or script capable of answering the following questions:
At which time of the day does the user have the most activity in messenger?
At which time of the day does the user have the least activity in messenger?

By which time of the day i mean a rough scale of hours.
I think 24 values like "activity between 7 pm and 8 pm" could easily stored and the accuracy of one hour would be appropriate.

Not only would this information be fun but also useful: such information could be used to optimize messenger usage.

My request ( http://shoutbox.menthix.net/showthread.php?tid=84898 ) for such a script has only got a reference to stat center so far so i thaught this would be the right place then.