Professional video game players practice up to 17 hours a day because "brute force number of hours" is the only way to improve

Watch Business Insider's documentary "League of Millions" on iTunes and Amazon

In this scene from the film, Team Liquid players reveal how they spend their money and the difficulties of playing video games at the highest competitive level.

In "League of Millions," it's the middle of the 2015 League of Legends season. World famous Team Liquid has one goal: winning the World Championship. Six-figure salaries. Grueling 18-hour days. Thrilling victories and devastating defeats. Five young men from vastly different cultures, united by a single dream: to be the best team in the world. 

Directed by Sam Rega. Edited by Josh Wolff. 

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