If you have a company in Mexico with employees on a daytime shift, the calculation you are making—or should be making—is one: how much your collaborators are going to work and how much that bill will come out to when the 40-hour reform goes into effect. The 48-hour workweek is not a whim of the employer; it comes from Article 61 of the Federal Labor Law since 1970. The upcoming reform changes that figure to 40 hours. The difference, on paper, seems like eight little hours. On the payroll, it turns out to be something else.