You can post anytime really as long as 2-3 people have posted before you. 
This is so that it gives others a chance to keep up and also allows for a more relaxed atmosphere that people don't have to worry about being left behind in or getting lost with so many posts by one person in a row. 

I may post once more tonight before heading off, not 100% yet, but might.

[b] EDIT: Also for anyone who doesn't know, I generally post Acacia and Koshmarik separately because both see the world a different way and while they are generally only one main character and her companion, he is played as if he is one to his own as a main. [/b]