Four-Day Planet by PIPER, H. Beam

Fenris isnt a hell planet, but its nobodys bargain. With 2,000-hour days and an 8,000-hour year, it alternates blazing heat with killing cold. A planet like that tends to breed a special kind of person: tough enough to stay alive and smart enough to make the best of it. When that kind of person discovers hes being cheated of wealth hes risked his life for, that kind of planet is ripe for revolution. (Introduction from the Gutenberg text)