Sometimes they swap out, some have gone home (I always send them off with a book like The Structure of Scientific Revolutions or The Brothers Karamazov based on their personalities) and others get transferred around the region. Longest I've had a single one is about 5 months. The official transfer schedule is every 6 weeks, but some get assigned to the same region for more than 1 transfer.
Sometimes they swap out, some have gone home (I always send them off with a book like The Structure of Scientific Revolutions or The Brothers Karamazov based on their personalities) and others get transferred around the region. Longest I've had a single one is about 5 months. The official transfer schedule is every 6 weeks, but some get assigned to the same region for more than 1 transfer.