Explanation:
The longest novel in Urdu literature is "Umrao Jaan Ada" by Mirza Hadi Ruswa. It is a classic and one of the most significant works in Urdu literature, known for its depth and historical significance. However, if you are specifically asking about the novel with the most pages or word count, it is often debated, but "Aag Ka Darya" by Qurratulain Hyder is also considered one of the longest and most intricate novels, covering several generations and historical events.