Top 100 Portal 2 Videos With The Longest Duration by Templin Institute ArchivesTop 100 » 200 » 300 » 400 » 500Video TitleDurationCategoryGame1.[Part 3] Saving Science in Portal 2! (Playthrough) | FYIF2:20:25Portal 2 2.[Part 1] Figuring Out Our Portal Guns in Portal 2 Co-op! (Playthrough) | FYIF2:03:03Portal 2 3.[Part 2] Solving Puzzles With No Problems Whatsoever in Portal 2 Co-op! (Playthrough) | FYIF1:56:36Portal 2 Top 100 » 200 » 300 » 400 » 500