10,000 Hours' is a song recorded by American country music duo Dan + Shay and Canadian singer Justin Bieber. It was released as a single from Dan + Shay's upcoming fourth studio album on October 4, 2019. It was written by Dan Smyers, Shay Mooney, Bieber, Poo Bear, Jordan Reynolds, and Jessie Jo Dillon, and produced solely by Smyers. The song debuted at number four on the US Billboard Hot 100. It also made history on Billboard's Streaming Songs chart by becoming the highest-charting non-holiday country song in the history of the chart, besting the number nine peak of Florida Georgia Line's 'Cruise'.