There are some that take me 10 minutes, including some decently long ones if I've been hit by inspiration from the other person's last post.
The majority of my posts take 30-45 minutes or so if I just sit down and write them... and I seldom do that. Often I'm looking at other things, chatting, poking at homework... I'm a multitasker. So one post can easily take me two hours. I have no idea how I would do like 3 per hour unless they were 3 of the quick, inspired posts. :)
I like the term, though. Hee!