Here’s an old post from Sarah Weinman about statements by Thriller Author Greg Iles on writing a book in a year’s time. He said, “So many thrillers today are formulaic and one-dimensional. I feel like there used to be a higher standard. . . . if I’m completely honest, three of my first four books are the best I ever wrote because I spent two years apiece on them.”
As a bit of balance, here’s a writing technique article by Sci-fi Author William Dietz, called “How To Write A Book A Year While Holding Down A Full-time Job, Maintaining Key Relationships, Staying In Shape, And Maintaining Your Sanity.“