Going back to the thread, here are some of the slowest times I came across:
Terry Kay (The Treasure Map of Jean Lafitte): 0:30 (She never completed the monkey but had she done so, it probably would've been one of the slowest times in Legends)
Jessica (The Lost Logbooks of Magellan: 0:32 (she is the slowest contestant to actually complete the monkey)
Larry (The Mysterious Manuscript of Mary Shelley): 0:39 (He grabbed the first part at around 39 seconds. Had he completed the monkey, it probably would've been one of the slowest assemblies on the show)
Kelly (The Jeweled Necklace of Montezuma): 0:43 (She grabbed the first part at 43 seconds and never completed the monkey. Had she completed the monkey, it probably would've been the slowest completion.)
The contestants in bold never actually completed the monkey at all, but I included them because had they finished assembling them, then they would probably rank near the slowest on the show. I think Kelly or Larry would've taken it easily though.