A martial arts student went to his teacher and said earnestly,

Student: “I am devoted to studying your martial system. How long will it take me to master it.”

The teacher's reply was casual,

Teacher: “10 years.”

Impatiently, the student answered,

Student: “But I want to master it faster than that. I will work very hard. I will practice everyday, ten or more hours a day if I have to. How long will it take then?”

The teacher thought for a moment,

Teacher: “20 years.”