The Scrum of Scrums meeting is a coordination meeting between Scrum teams working on the same project or related projects. It is designed to ensure that different Scrum teams are well-coordinated and any impediments that affect multiple teams are addressed. By its nature, it is a time-boxed meeting to keep it focused and efficient, ensuring that all teams can proceed without unnecessary delays. This aligns with standard Scrum practices where meetings are time-boxed to promote efficiency and discipline. Therefore, the statement that such meetings are always time-boxed is true.