[mc808]

A good experiment might be to watch 1,000 hours of educational videos and see if you've actually learned enough to test out of an introductory course on the subject. I could see that happening with, say, Khan Academy, but less so with the various popular "wow, science!" types of videos.

[legohead]

I've watched probably 1000 hours of woodworking videos. I even bought a whole shop of tools.

When I get an urge to make something, I go into the garage, and freeze. How do I put two pieces of wood together again?

[Namrog84]

Do you think if you had read the 1000 hours of wood working books that you'd be any better off?

There clearly comes a point that even in depth studying of a topic has limited ability to translate to real world skill. Very few things can translate well from study go skill.

[petawatt]

Just like going to all the lectures and not doing any homework isn't going to prepare you for finals. Videos introduce and explain ideas, but you need to puzzle through problems yourself to gain a real understanding.