I was in the middle of writing a scene that happened to have a lot of dialogue. Before I realized it I had like 30 lines full of back and forth talking between two people with pretty much nothing breaking it up. And it got me thinking... does anyone have a hard and fast rule for breaking up dialogue so that you don't run into that issue? Maybe 30 lines is fine (maybe not in some cases), but I'm sure at some point the reader doesn't want to just hear nothing but conversation. And what do you tend to break up the dialogue with?