I'm in my seventh year as a high school drafting instructor, after being a drafter for 25 years. When I took the class we lettered for 2 weeks, 2-1/2 hours a day. I don't know of a single kid today what would or could sit and do that now. The first year I taught we did manual drafting for maybe 2 months. But now, none at all. I'lve come to realized the good ones are going to 'get it', and the others won't, manual or CAD. I'm still trying to decide if I'm training drafters, or CAD techs. And since this is a CNC forum, wouldn't creating a manual drawing just add a step between idea and product?