More than you might think (unless you're listening to a bland narrator, but that approach seems to be out of style for obvious reasons). You're listening to a performance, after all, and any performer brings their own interpretation to the role, regardless of how careful they are to follow the direction given by the author in dialogue tags and context.

Think about watching musicals or plays performed by a different cast and how different they can be. Or think of movie adaptations or remakes (depending on how much was changed); for instance, you can find YouTube compilations comparing the same scene in different Pride and Prejudice adaptations, and they're saying the same dialogue and going for a similar effect but the characters' personalities feel very different.