I think that is about right. And GrannyT made the comment that it was not that her teachers knew everything, but they knew which book to look in.
Buit that is really what counts. Nobody can know everything. I always used to tell the people working for me that I don't have all the answers. Usually I have a very good idea of where to go to GET the answers. When trying to come up with a new method of doing something, I would always welcome any ideas, from managers or janitors. You never know where a good idea is going to come from because everyone has a different take on things due to their own experiences. But if I needed something SPECIFIC, I would try to go to the best person for an answer. For example, if you need to know when the garbage at your office is picked up, you wouldn't go to the IT department. And if you wanted something automated, you wouldn't consult the janitor. You would go to whomever is most likely to be able to help you.
Even Doctors don't know everything. But hopefully, the ones working on you know when they need to refer you to a specialist. You regular doctor has extensive knowledge of the circulatory system and the heart, but they are NOT a Cardiologist. And if you have a heart problem, you WANT a cardiologist.
But, yeah, 10,000 hours sounds about right. I was in one industry for about 20 years, but it was only in the final 10 years that I reached the Director level. And probably only the last 6 or 7 when I didn't feel like I was faking that!
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