Sometimes the effect is immediate when disputing our beliefs and the feeling instantly, dramatically and permanently changes for us just from disputing it once.
Sometimes like in the case of more deeply held core beliefs we find ourselves encountering and disputing the same beliefs from different angles and over a longer course of time as they change more slowly, for us, when this happens it feels like a deeper, more embodied change that changes our perception of ourselves and reality and changes how we feel much more deeply, even though it can take more attempts and more questions and time.