Uh Clem's Admin World

As I roll out the Notes 8.0.2 client to users they are discovering the great feature of the user info pop-up when you hover over a name in the Sametime contact list.   Some are discovering their own info is wrong, so we are getting requests all of a sudden to update user's contact info in the Notes directory.   I did not anticipate this unexpected user need.

Some of the user contact info we updated a day ago, but the new info was not appearing in the ST contact list pop-ups.  A user can right-click on a name and select "Refresh Person Info" to force the update.  But my question is why hasn't the server performed the update after a day?  What is the trigger for the server to refresh all this info on its own?   Is it a ST server restart, or what?