Agatha Christie took 3-4 months for each book... https://www.agathachristie.com/news/2021/a-life-in-numbers-1890-1976#:~:text=3%2D4%20months%3A%20Agatha%20Chri

Agatha Christie took 3-4 months for each book... https://www.agathachristie.com/news/2021/a-life-in-numbers-1890-1976#:~:text=3%2D4%20months%3A%20Agatha%20Christie's,months%20to%20write%20a%20book https://www.agathachristie.com/news/2021/a-life-in-numbers-1....