I often second-guess myself in one particular scenario when writing dialogue. Convention says I should break different characters' lines in different lines or paragraphs (I've seen both), but what if one particular line of dialogue is longer than usual? Should I break that line in different paragraphs, even though it's said by the same person and therefore risking making it look like another person is speaking? Or is it expected that the line, along with some actions in between, are all in one big block of text.
I'm asking mainly because the resulting block of text doesn't visually look, as a whole, as part of the dialogue, because it breaks the usual visual pattern of smaller lines going back-and-forth between different characters.