The average time duration for the UPSC Main Examination papers is generally three hours per paper. During the Mains, candidates must complete a total of nine papers, which include optional subjects, a language paper, and general studies. It is crucial for aspirants to manage their time effectively within this duration, as each paper tests analytical and writing skills under time constraints. Efficient time management strategies, like practicing past papers and adhering to a schedule, can help candidates perform optimally.