There is no "typical" in the sense of some common movement except that most people even with jaw deformities don't require advancements larger than 10-15 mm. There is no limit though except for the skill of the surgeon and how much movement is needed so with correct hardware used, good surgical technique and sufficient measures taken to ensure post-operative stability, you can move a lower jaw for example up to 40 mm if necessary. I don't think I've seen more than that because a person who requires that extreme lengthening usually has literally no chin definition horizontally. Most people just don't need that much advancement so it's not typical.