Hey Bellfest, back to your original Question, a friend of mine who started instructing after he had 1500 hours rotary, said that that should be around about the minimum, as he knew he knew nothing about flying at 150-200hours....although he also understands that ecenomics dictate and wishes there was a solution. Not only does he teach people to fly and pass a test, but he now passes on valuble knowledge from experience that may save the students life one day, something he wouldn't have at 200 hours..
He now has 3000 hours,(1500 teaching) but also states some of the instructors he knows with more hours are good pilots but not very good instructors, so hours are not everything.
I wish there was a solution.
Fatigue.