"Failing fast" and "10,000 hours to expert" are two entirely different kinds of learning. "Failing fast" is a lean startup idea where you are trying to learn, as quickly as possible, whether you have a viable product. You do the least you can do to determine this. After you have learned this one thing, if you find that no one is interested in your product, you are done. Move on to the next idea.
"10,000 hours to expert" is a different idea. Here, the idea is that to become an expert in a specific skill, you have to put in 10,000 hours of 'deliberate' practice.
These are two different kinds of learning. The '10,000' hours approach is not the kind of learning you need or want to do to determine the validity of one business idea. In this case, time invested is not necessarily correlated with learning.
"10,000 hours to expert" is a different idea. Here, the idea is that to become an expert in a specific skill, you have to put in 10,000 hours of 'deliberate' practice.
These are two different kinds of learning. The '10,000' hours approach is not the kind of learning you need or want to do to determine the validity of one business idea. In this case, time invested is not necessarily correlated with learning.