Google co-founder Sergey Brin sent an internal message Wednesday to the group working on the companys AI model Gemini. In the message, Brin wrote that Google can become a leader in AI development provided that employees work more.I recommend being in the office at least every weekday, Brin said in a message quoted by The New York Times. Sixty hours a week is the best for productivity.Brin sees an increased risk of burnout when working more than 60 hours a week, but at the same time criticized employees who he says do not contribute enough. Some people work less than 60 hours and some dont put in more effort than they have to, he wrote. The latter are not only unproductive, but can also be very demoralizing for everyone else.It is not clear from the report whether Brin himself is in the office at least every weekday and works 60 hours a week. According to the newspaper, Brins statement should not affect Googles work-from-home policy, which states that employees must be in the office at least three days per week.