That means that, for the most part, you don't get paid overtime. If you are not paid wages and salary for overtime work, the near term return on your investment of time is zero. Working overtime may be financially productive if you get stock options or a big year end bonus. I thought not. You probably shouldn't either.
Organizations have different cultures.
These are the guys that just love calling Saturday morning meetings to handle tasks that easily could have been completed in 5 minutes on Thursday. Even highly valued employees in secure positions have to put up with some of this nonsense. Playing tennis and golf didn't make the list. Regrettably, you need to have your head down and look busy when the boss passes the door to your office. Read magazines or newspapers at work.