I am working on a novel in which the characters talk to the protagonist and explain lot of backstory. It can run into tens of pages - essentially the entire story is told by the character to the protagonist and the reader is a third person learning about it in parallel.
My question is: what are the rules for quotes in these kind of conversations.
For instance (H: hero, C: a local character)
Page 1: H: So, how did you end up here?
Page 1 - 15: C: tells a 15-page long story ......
Page 16: H: "But, didn't you realize that what you were going after had these issues early on?"
Page 6-30: C: gives a long explanation with a couple more backstories involved.
In this case, I'd quote all the "H"'s statements. But what about the "C"s dialogue? How should it be written.