There’s a story (true or false, I don’t know) about the famous artist, Pablo Picasso.
It seems a woman came up to him and asked him to sketch something on a piece of paper. He sketched it, and gave it back to her saying: “That will cost you $10,000”.
She was astounded. “You took just five minutes to do the sketch,” she said. Isn’t $10,000 a lot for five minutes’ work?
“The sketch may have taken me five minutes, but the learning took me 30 years,” Picasso retorted.
From here.