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The 10,000-Hour Rule by psychologist Anders Ericsson

This post was last updated by José of onez on Saturday, 22 February 2025.

The 10,000-Hour Rule is a theory based on research by psychologist Anders Ericsson, who studied expert performance in various fields. The theory suggests that achieving expertise in a particular domain requires approximately 10,000 hours of deliberate practice. However, simply spending 10,000 hours on an activity is not enough. The study recognizes that the quality of practice—including focused, structured, and feedback-driven training—is what leads to expertise. Thus, 10,000 hours is not the only key factor; there is no universal number of hours to master something—it varies based on the individual and the domain. While practice is crucial, other elements like genetics, motivation, access to resources, and mentorship also significantly influence expertise.

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