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Source: https://writers.stackexchange.com/a/37733
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

This isn't unreasonable. To give you an idea of a long cast list in a novel, take a look at the Harry Potter series. There are a ton of characters of various import to the narrative. Jim Dale, who recorded the U.S. audio books of the series, holds the Guinness Book Record for most voiced characters in a single audio book (134 in _Harry Potter and the Order of the Phoenix_) and then proceed to break his own record when he recorded 146 voices for _Harry Potter and the Deathly Hallows_.

Now, not all characters are equal, and Jim did record unique voices for such characters as The Ticket Taking Witch at the Quidditch World Cup... and that's literally everything we know about her. There is also probably the narrator voice, who was very close but still distinct from Harry Potter's speaking voice.

Wikipedia states that their are 8 main characters in Harry Potter (each getting a dedicated page). Supporting characters include Ginny (dedicated page) plus four additional pages classifying supporting characters by their associations (Hogwarts Staff, Order of the Phoenix Members, Dumbledore's Army members, and Death Eaters members).

Original score: 2