Trivia: The makers placed an animatronic head over a sumo wrestler's body to create the cyclops.
Continuity mistake: When Telemachus is born and Penelope and Odysseus hold him, Penelope's hand goes from touching the baby's arm to touching his head.
Answer: The Trojan War itself was a decade long, followed by Odysseus' ten-year journey home to Ithaca, so all told he was gone roughly twenty years.