[b]Vesuvius00[/b] Good question and I'm glad you asked. Unless a character I'm in control of is interacting directly with one of you, I won't be posting until everyone has posted once. With that in mind, I would put the limit at 3 posts per person in between my posts. When I say three, I want you to imagine me going like "eeeeeh" because if you end up with three posts that are each a BILLION paragraphs long, people are going to have trouble catching up. But if you only post, lets say two or three paragraphs, perhaps interacting with specific people, then 3 is more agreeable. 

Another thing to keep in mind is peoples activity. If you can't be on that often, or you're on all day everyday, it's encouraged you let us know, especially when someone else is interacting with you. I can check this site at least once a day during the later hours. But I do work 2 jobs so It may take me upwards of 2 days to get a post out in the worse case scenario.