I'm not sure about the Audible question. I know the actual recording/production of one of my books takes about ten days, but beyond that, I'm not entirely sure.
It's interesting to write with another person. In a sense, my "Merlin Trilogy" was a collaboration, since I was working with, and greatly expanding, the original material. In the case of "World of Obsidian", Ms. Lackey and I kick ideas back and forth to come up with the basic plot. I send her the chapters as I finish them, and sometimes she'll make suggestions. Sometimes she'll write a scene off the outline (out of order), and I'll incorporate it. I really prefer to work with a collaborator, as it gives me a much stronger idea of what the finished story will be like.
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It's interesting to write with another person. In a sense, my "Merlin Trilogy" was a collaboration, since I was working with, and greatly expanding, the original material. In the case of "World of Obsidian", Ms. Lackey and I kick ideas back and forth to come up with the basic plot. I send her the chapters as I finish them, and sometimes she'll make suggestions. Sometimes she'll write a scene off the outline (out of order), and I'll incorporate it. I really prefer to work with a collaborator, as it gives me a much stronger idea of what the finished story will be like.