Some individuals I have trained required far fewer hours but were still required to complete the allotted time.
You have to leave time for some old guys to retire first.
Minimal training can take place quite fast. Many types of "certified" training strive to achieve a minimum level of achievement based on minimal accepted standards. Good examples are most all "licenses". Being minimally trained is supposed to prove you are not dangerous to the general population it has never been a demonstration of great levels of skill. I think it tends to get those results just fine.
Malcom Gladwell comes at it from a different direction. He interviews people that have achieved a very high levels of ability. It is probably a mistake to assume that 10,000 hours always gets the same results. Many achieve minimal levels of ability quite quickly but spend 40,000 hours demonstrating it day after day. Some people fail to learn what they don't know and never know they missed it. I suppose if you never stop finding things you don't know you just might make it.