I'm not sure which light novel has the absolute longest title. There are so many light novels out there. It could be some complex and wordy Japanese light novels which often have long and descriptive titles.
This question was a little difficult to answer because the definition of "literary title" was not very clear. However, if we consider it according to the definition of "novel," the longest known novel is titled "Anna Karenina" by an Italian author (Italian name: Dante Alighieri). The 66-volume novel was published in 1886 and is one of the most famous works in the history of Italian literature.
The novel with the longest title in Qidian was Rise of the Great Qin Empire, with a total of 264 words. The longest chapter title was the 'Library of Heaven's Path', with a total of 229 words. This chapter introduced a mysterious library that stored countless secrets and treasures.
I'm not entirely sure which one is the absolute longest light novel. However, some very long-running light novel series exist, like 'A Certain Magical Index' which has a large number of volumes and is quite extensive in its storytelling. It delves deep into a world filled with magic, science, and complex characters.
The book with the longest title in the world is between pages 408 and 417 of the Constitution of the People's Republic of China, which contains the specific content of the constitution.
The world's longest novel is currently uncertain because no one has yet to choose the world's longest novel. However, according to the length of the longest known novel, Harry Potter and the Sorcerer's Stone, it has a total of 768 chapters and a total length of about 7.3 million words. However, this is only an estimate because some novels may contain fewer chapters and others may contain more chapters.
One of the longest - running light novels is 'The Slayers'. It has been around for a long time and has a huge following. It's filled with magic, adventure, and interesting characters.
Honestly, there's no straightforward answer. Light novels' lengths can vary greatly. Some series might seem long because they have a rich plot and extensive character development over many volumes and years of publication.