How do you limit revisions so the project does not drag on?

Two rounds are closed against the same brief, and a third only fixes a text or measurement error. The job drags when every round changes the idea and the sign is never ordered. Before the first proof, the partners write what the mark has to do and who has the last word. Without that name, every message reopens the work. In venues with two owners, one approves on Friday and the other changes it on Monday. The printer waits and opening day arrives with the old menu. The scope on WhatsApp states the two rounds, what counts as a new brief, and the date files go to print. After that date, a new preference is another job.