There are people who like to spend extra time at work, in order to avoid their families. This would presumably not be your case.
Doing voluntary overtime is frowned upon by colleagues, because you are defecting in a Prisonner’s Dilemma. By sacrificing your free time to Moloch you may make a better impression than they, but if everyone followed your example, you would all be worse off (except for your boss, who would get a lot of extra work for free). Also, some colleagues would not be able to follow your example, e.g. because they need to take care of their families. The company would be tempted to fire them, and replace them by more people like you. (Only to fire them when they get older, and replace them by another fresh wave.) Please, do not defect against the social norm of 40-hour work-week! -- This again would not apply to you, if you do the extra work outside your job.
Then, there is also a question of alternative things you could have been doing in your free time.
There are people who like to spend extra time at work, in order to avoid their families. This would presumably not be your case.
Doing voluntary overtime is frowned upon by colleagues, because you are defecting in a Prisonner’s Dilemma. By sacrificing your free time to Moloch you may make a better impression than they, but if everyone followed your example, you would all be worse off (except for your boss, who would get a lot of extra work for free). Also, some colleagues would not be able to follow your example, e.g. because they need to take care of their families. The company would be tempted to fire them, and replace them by more people like you. (Only to fire them when they get older, and replace them by another fresh wave.) Please, do not defect against the social norm of 40-hour work-week! -- This again would not apply to you, if you do the extra work outside your job.
Then, there is also a question of alternative things you could have been doing in your free time.