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STEM professions emphasize meritocratic ideals and the work devotion schema, prioritizing unwavering commitment to work. While these norms are central to professional success, marginalized groups face substantial barriers that limit their ability to conform. Sexual minority STEM workers frequently encounter workplace discrimination and devaluation, which can diminish their identification with these professions. At the same time, some may overcompensate for stigmatized identities by working longer hours to demonstrate competence. Using survey data from cisgender professionals in computer science, engineering, and mathematics, this study examines work-hour disparities by sexual orientation. Results show that sexual minority workers in general report shorter work hours and are more likely to hold marginal part-time employment than heterosexual peers. However, among full-time employees, sexual minority workers report longer hours. These disparities are particularly pronounced among men in co-residential relationships or with children, highlighting how family dynamics intersect with sexual orientation to shape work-hour patterns in STEM fields.