Here's mine. I'm not sure how long it takes for updates to appear, but I can tell you it isn't less than five minutes. *grin*
So how does one find out what someone's key is?
You can visit one of the many name to key services like this one.
Or, drop this script into a prim, save it, and touch the prim. It'll say the key of whoever touches it.
llWhisper( 0,(string)llDetectedKey(0) );