15 time in 2 hours, sorry, not happening... There is at least a 10 minute delay, and up to about 72 hours I think a Blizz Rep reported once.

Anyway, just try not to use too many programs at one time, and take your time in the channels and when loading characters and what not. I hear that if you type something in the chat room before exiting to get a new character, you have a much beeter chance of not getting realm down. And try to stay in a chat room for a few seconds before going nuts on all the menu buttons!!