Estimated Epic Timeline
Thank you to @navy-nyoom for the information. This is all just my estimation that might be wrong.
The Trojan war (Beginning of Troy Saga) lasted 10 years.
The Cyclops saga was probably around 3 months, since they had to sail to the Lotus Eaters island.
The Ocean Saga was probably 6 months or so, with Odysseus sailing and Poseidon drowning most of the fleet
The Circe Saga was probably two months or so, since they washed up on Circe’s island and had to travel to the underworld.
The Underworld Saga was probably a year considering Odysseus’s MAJOR ptsd in Love in Paradise, and having to sail through the underworld and back out.
The start of the Thunder saga makes it 12 years from Ithaca and assuming that it takes like, 5 months after Different Beast to get to Scylla and an unknown amount of time for Odysseus to land on Calypso’s island to make it 13 years.
The Wisdom Saga makes it 20 years since Odysseus left Ithaca with the 7 year time skip from Thunder Saga spent on Calypso’s island.