To write a novel of more than 300,000 words, one had to consider many factors such as the genre, plot, characters, and theme of the novel. In addition, he also needed to calculate the fee for every 10,000 words added to the novel. If the novel was very popular, it might not need too many drafts. It just needed to continue writing. However, if the novel was not very popular, it might take more time to collect and edit drafts. Therefore, he could not give a definite answer. It is recommended that you make a detailed plan and constantly evaluate and adjust it during the writing process. If necessary, you can also consult an experienced editor or get more information about writing and royalties.