Asking for YOUR Opinion: How Frequent Should We Post?

Chris and I are planning to post the next part of the Eerie saga, "Eerie Saloon: Seasons of Change -- Spring" in early 2014. We apologize about the delay. Life happens.

Here's my question. The story will have thirteen chapters, each between 45 and 75 pages. How often should we post a chapter?

Twice a week (3-4 days)
Once a week
Twice a month (every two weeks)
Once a month

Please, as many of you who can, give us your opinion.