Sia only works four hours a week because she is determined to "get the most out of life".
The Chandelier singer refuses to spend long days in the studio writing and recording songs, and places strict limits on her working hours so she can spend more time having fun.
"My modus operandi is a four-hour work week. I'm trying to work out strategies for getting the most out of my life, so that I can spend time with my friends, my dogs and my husband," she tells Britain's The Observer music magazine.
Sia, who has written for singers including Rihanna, Beyonce, Adele, Britney Spears, and Katy Perry, admits she has no plan to put in as many hours as other pop stars, adding, "(A schedule like Beyonce's) would make me suicidal...
Thinking that for two years I just have to get on this mouse-wheel and go round the world talking about myself, and singing the same songs. I respect the women I write for, because they work hard in a way I could never do."
Sia just released her seventh studio album, This Is Acting, which holds 12 songs originally intended for, and rejected by, A-list artists, including Beyonce, Adele and Rihanna.