el novelón - a long novel, often (although not necessarily) one that is of low qualitySpanish example: Soy amante de la literatura trivial en general y de los novelones de más de quinientas páginas en particular.
English example: I am a lover of trivial literature in general and particularly of long novels of more than 500 pages.
Source: el novelón - a long novel, often (although not necessarily) one that is of low quality (https://www.123teachme.com/spanish_feeds/word_of_the_day/2024/9/19)