I haven't been teaching that long, just graduated from the university. My students I have had the longest have been with me 3 years. And they seem to be enjoying themselves and sticking around. But I imagine that after some time they might require a new situation and move on. They are in junior high, so there will be that difficult time when they go off to college and leave me..I'd never thought how sad that will be! But I imagine I will be very proud of their accomplishments.My worst week teaching was when 3 students left me for different reasons. I become very self-consious and worried..now I look back at it and realize all the motives were valid and it was just a terrible coincidence.