“The Alchemist" by Paulo Coelho: How did he write it in Two Weeks?

"Is it true you wrote it (1) in four weeks?"

“Two weeks. The book was already written in my soul" (2).

Comment: I infer from my study of other writers in this blog that the book was probably already written by his storytelling alternate personalities.

1. Paulo Coelho. The Alchemist. Trans. by Alan R. Clarke. 25th Anniversary Edition. New York HarperOne, 1993.

2. Hannah Pool.The Guardian Interview of Paulo Coelho, https://web.archive.org/web/20161128235051/https://www.theguardian.com/books/2009/mar/19/paulo-coelho-interview