For all those who want to explore one of 20th century’s argueably greatest novels: I do recommend to stick to this excellent Audiobook version from an Irish Radio 1982 production. All the different characters incl. the inner monologue are spoken by different actors and it makes the whole affair far more digestible. It is well worth the effort, as Ulysses iss one of the most complete novels ever written, no matter from which angle you look at it !
Here is the link to the 1st episode.