To evaluate the inequality effects of 35 hours, we use a very general labour demand framework taking into account various skills and the impact of the work duration on wages, productivity and labour organization. Numerical simulations include several constituents of devices Aubry and consider wide but realistic ranges for the various parameters. The 35 hours always increase the employment level but have a negative effect on working hours. Moreover, it reduces the employment and wage inequality within the whole labour force and across workers, but increases welfare inequality. Classification JEL : D63, J23, J38.