Plot hole: There is a wide shot of the men going off to hunt deer on Circe's island, and you can count at least ten of them. When Odysseus comes to rescue them, he sees two along the way, and then there are four in Circe's palace. Of the two back at the beach, one was changed into a pig, and the other is a human that said "Only Polites (the pig) escaped". That adds up to eight men. So at least two are missing.
Continuity mistake: When the men enter the cyclops' cave, Odysseus crouches down and says "They keep sheep in this cave with them". Between shots his arm goes from being at a 90 degree angle to being at a 45 degree angle.
Trivia: The makers placed an animatronic head over a sumo wrestler's body to create the cyclops.
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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.