 This study suggests that working hours have a direct impact on cumulative fatigue, but also that this impact is mediated by occupational stress. This means that working hours can cause cumulative fatigue even if they do not lead to high levels of occupational stress. Therefore, it is important for employers to take steps to reduce occupational stress among their employees, such as providing adequate rest breaks and ensuring that employees have access to supportive resources. This article was offered by Yuxuer Liu, Zhili, Qingsong Chen, and others.