The expected word limit for essays in the UPSC mains examination is approximately 1,000 to 1,200 words per essay. Candidates are tasked with writing on specified topics, reflecting their understanding, analytical abilities, and writing prowess. Essays should be cohesive, well-structured, and relevant to the topic, showcasing the ability to articulate thoughts clearly. Practicing under timed conditions can help candidates manage their writing effectively and develop a precise argumentative style conducive to achieving high scores in this segment of the examination.