Did you read the article? He's not advocating for doing 10 times as much. He's just setting the bar for fluency / excellence in a topic. He even says > Eithe

Did you read the article? He's not advocating for doing 10 times as much. He's just setting the bar for fluency / excellence in a topic. He even says > Either that, or admit that you’ve got higher priorities. No one succeeds at everything. If you’re not willing to do ten times as much, just level with yourself: “I’ve got better things to do than learn a foreign language.” “I’ve got better things to do than become a great economist.”