It's 10000 hours of deliberate practice, not mere activity, that's necessary according to this theory. Deliberate practice requires that you're constantly chall

It's 10000 hours of deliberate practice, not mere activity, that's necessary according to this theory. Deliberate practice requires that you're constantly challenging yourself and attacking more ambitious goals. The conversion ratio on paid work for very few jobs is anywhere close to 1.0; a job where it's 0.5 would generally be considered excellent.