What was the primary reason Odysseus took so long to return home?

Odysseus faced numerous challenges and obstacles on his journey back home from the Trojan War, including encounters with mythical creatures such as the Cyclops, the Sirens, and Poseidon's wrath. These challenges caused delays in his journey and led to his long absence from Ithaca. Additionally, he was held captive by the nymph Calypso on her island for several years before finally being released.