Put differently, 80% of his time gave his brain training and practice which likely improved the 20% that made it to market.
Also consider, frustrating though I'm sure that was, he probably still got paid for his effort in the 80%.
Also consider, frustrating though I'm sure that was, he probably still got paid for his effort in the 80%.
- how many hours did a musician spent on his instrument before selling his first record ? - How many drawings/paintings before Picasso could sell something ? (etc.)