That is a bit much for a minimum requirement... I'm pretty sure that if it takes someone thirty years to feel ready to teach, then I wouldn't want them teaching me any more than a person with no experience... Lets face it, not all dancers are equal, and a persons natural ability and dedication to dance can in a huge way be the determining factor in when or if they ever become ready to teach. I cartainly agree that a total novice should in no way be teaching, but an individual with three or four years of solid & dedicated experience, has certainly put in the time to teach beginners. Furthermore, I would go as far as to say that any student who is looking for the most perfect and experienced instructor that they can find, is short changing themselves from the beginning. The simple fact of the matter is that different instructors have different strengths, and students, especially those with a dedicated partner, can benefit highly from working with multiple instructors.