My contract specifies a 7.5h workday... But I do only 6h/day, and so do most of my colleagues. I am very lucky: I live in France, this country has a strong cult

My contract specifies a 7.5h workday... But I do only 6h/day, and so do most of my colleagues. I am very lucky: I live in France, this country has a strong culture of "stay late at work and the boss will like you", yet my firm does not care about that. It cares about getting sh*t done. This is a broader subject than "work hours": my firm thinks that staying more hour to procrastinate is not not useful, and it believes that employees are more efficient when they are happy! In order to have an efficient workforce and less turnover, I think any business should try to answer: "for each employee: what conditions does he/she need to be happy at work?".