Defaults are teaching numbers. Change weekly hours, years, quality (stretch + feedback) and consistency. The chart is not a promise that any child becomes an expert at a round number of hours.
Educational illustration — not a training prescription or a 10,000-hour promise.
Practice gallery
Teaching presets — tap to load, then tweak.
- Clock hours2,496
- Effective hours1,217
- Effective / clock49%
Clock hours
Effective hours
Frequently asked questions
Is this a 10,000-hour calculator?
No. The 10,000-hour slogan is Gladwell’s popularisation. Ericsson studied designed, feedback-rich practice in specific domains — not a universal hour quota.
What are “effective hours”?
Clock hours multiplied by quality (stretch + feedback) and consistency (weeks actually trained). It is a teaching lens, not a lab measurement.
Does more practice guarantee excellence?
Macnamara et al. 2014 found practice explains a minority of performance variance. Hours are necessary in most crafts and still not sufficient.
How should I use the gallery?
Load a preset, then change one input at a time. Watch how quality and consistency move the effective curve more than raw volume.
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