Malcolm Gladwell, who has amazing hair, posits that it takes ten thousand hours of practice to before it's possible to master a field (though not everyone agrees). It’s been a while since I listened to his book Outliers, but I recall him using The Beatles as an example: they finally made it big after ten thousand hours of playing. Innate talent is nothing to sneeze at, but there are no shortcuts. You've got to do the time.
I wonder how the rule applies to writers. What counts toward the magic number? Grade-school essays? Work emails? Cover letters, church bulletins, Facebook posts?
The time I've spent writing fiction in my lifetime only amounts to perhaps a few hundred hours, so I hope time spent with other types of writing gets to contribute to the 10,000 goal. Otherwise my plans for a career as a novelist may need some revision.