A blank line starts a new paragraph, which is a longer pause. A sentence wrapped over two lines is still one sentence. Each sentence is voiced and cached on its own, so editing one line re-bills only that line.

Voice, model, stability, similarity, style and rate are all part of the narration cache key — change one and every line re-bills at ElevenLabs.

Everything here lives in this page's URL, so the link is the save. Send it to me and I'll drop the script and settings into the project on the Mac and render — the pipeline needs ElevenLabs, ffmpeg and the frame renderer, none of which run in a browser. Line counts and characters below are exact; whether a line is already cached I can only tell from the Mac.