It really depends. Generally, a fantasy fiction novel can be considered long enough if it fully develops the story, characters, and world-building. A minimum of 50,000 words might be a rough starting point, but some can go well over 100,000 words and still be engaging.
It's non - fiction. Ishmael Beah, the author, actually lived through the horrors of war and being a child soldier in Sierra Leone. His account in 'A Long Way Gone' is a memoir, which means it's a true story of his journey from a normal boy to a child soldier and then his struggle to regain his humanity. There are many details in the book that can be cross - referenced with historical events and the situation in Sierra Leone during that time, which further proves its non - fictional nature.
Here are a few recommended sci-fi novels:
1. " Planet Escape ": This novel tells the story of the earth stopping its revolution for some reason, and humans must escape from the earth and survive in the universe. It was a soft science fiction novel that contained elements such as rebirth, doomsday, black technology, and so on. The concept was rigorous, the imagination was open, and the setting was reasonable and exciting.
2. " Wandering Meteorite ": The male protagonist of this novel is reborn as a meteorite and grows into a wandering star by absorbing the mass of the universe. He found the Wandering Earth and became the new sun, leading the entire solar system towards the center of the universe. The story was filled with the exploration and development of science and technology.
3. [Interstellar Judge: The author of this novel is Gu Jianfeng.] Although there was no detailed introduction to the plot, it could be speculated that this was a story about the Interstellar Judge, which might involve the plot of interstellar law and decision-making.
4. Star Trek: The author of this novel is Shangguan Loulan. Although there was no detailed plot introduction, it could be speculated that this was a story about Starfleet Trek, which might involve exploring the unknown universe and surviving.
These long sci-fi novels had rich imagination and thrilling plots, suitable for readers who liked sci-fi.