The title "10,000 Hours" was inspired by a theory popularized by Canadian author Malcolm Gladwell that it takes 10,000 hours of diligent practice to achieve world-class expertise in any skill. Smyers and Mooney spun that idea into a love song together with their frequent collaborator Jordan Reynolds ("Tequila
," "All to Myself
") and Jessie Jo Dillon, who is the daughter of veteran Nashville scribe Dean Dillon
"Whether it's 10,000 hours to get to know that person and truly love them in the best way or it's just the rest of your life, that's the hook," Mooney explained to Taste of Country
. "It's just about learning your significant other."
As they wrote the song, Dan + Shay began to envision their pal Justin Bieber singing the second verse. They got in touch with him via text and he immediately agreed to jump on the tune. Bieber and his go-to songwriting partner Jason "Poo Bear" Boyd penned a couple of extra lines, putting his spin on it.