The video took three days to perform, in which they practiced eight to ten hours a day.

Chopin never practiced more than three or four hours a day, he said.

"I practiced 5,000 hours, to perform for four and a half minutes," he said.

I have to tell these students that there is more to life than practicing 12 hours a day.

"I practiced so many hours it helped me stay off the streets," he said.

He practiced five hours a day because he wanted to.

He started to study electric guitar, practicing 16 hours a day.

"Sometimes it sounds better than when I was practicing four hours a day."

The musicians had played instruments for 15 to 21 years and now practiced 10 to 40 hours a week.

She studied ballet as a girl and practiced three to four hours every day.