I've never been a big fan of measuring the success of teaching or training by how difficult or how long it is. I realize that for the government, those seem to be valid metrics, so if you are working for a government entity, quantity not quality, is what matters.
No matter who we are teaching, or what we are teaching, the goal is not to pass information, but to develop in them the habits that characterize competent practitioners of the art (whether that art is running a machine, designing it, repairing it, or supervising those who do those things). Admittedly measuring that is MUCH more difficult than measuring how long they have been trained, without regard to the quality of that training. In reality what we should do is clearly identify what we want a successfully trained person to do, then design training to develop competency at that course of action.
For what it's worth, this is just my personal soapbox, and may not be exactly what you want.
