Quill, Parchment, & Ink

Hey y'all. I have a couple of questions for my f'listers who participate in big bangs. I run the Losers Mini-Bang (losers_minibang) and we're looking to get it going again (illfindmyway has stepped in as a second mod until alocine_89 is feeling better), but I need some things answered.

1) What is the typical length of a big bang?
2) Do they normally require a rough draft and then a final draft?
3) If they do require a rough draft, is there a reason and why?
4) Do they assign you a beta or is it your responsibility?
5) What is the typical length for the time period between claiming your prompt/signing up and turning in your finished story?
6) Is there a specific time of year your bang seems to run?
7) Does your draft get read by the mod or just by your beta before it gets posted?
8) Do you post directly in the community or do you post to your journal/AO3/fanfiction account and link it to the community?
9) Which of the above do you prefer?

I think that's it, thanks for your help! I'm looking to do some overhauling of the community before we re-open and just want to get some ideas. :-)