It's based on this great cognitive-science research that says if we can master 10,000 hours of effortful study at anything by the age of 21, we will be virtuosos at it.
Ji paremta puikiu kognityvinio mokslo tyrimu, kad jei praleistume 10000 valandų įtemptoms studijoms bet kurioje srityje, 21 metų būtume srities žinovai.