Why is there a wait time on private messages and what is it?
There is a default 5 minute waiting period between creating new private message conversations. The waiting period for replying to existing conversations is 15 seconds.
As your reputation increases on this site, the 5 minute waiting period will gradually decrease for you.
Updated: 4 month(s) ago | Sources: Andrew / Nuno
Direct link: http://real-people.net/faqs#question24