DH is salaried, and tries to stick to a 40 hour week. He had worked more in other jobs, and learned the hard way that it didn't really matter when it came to job cuts. It wasn't the "hard workers" that stayed. It wasn't the competent workers who stayed. It was the friends of the person making the decision who stayed. Or "he has kids and you don't," or pure seniority.
In his current job, the CEO noticed that the tech team was the last to arrive and the first to leave, and it bothered him. He talked to the tech team manager who did her best to explain that the tech team works when there is work. For a long time, they were able to accomplish everything that was expected of them in an 8 hour day, so that was what they worked. Now they are working on a very important project that will take the company to the next level. So for the last 2 months they've been working late hours, coming in on weekends, coming in at 5AM, etc. And now the CEO understands. When it is necessary, they will be there, working their butts off. If it's working long just for the sake of working, they don't do it. They aren't married to the job, they aren't parents to the job.