I'm in consulting and every firm is different. It all depends on management style and how the company is structured. My current boss actually worked for the government early in his career. He said, "My first day, my boss showed me his typical day. We went to the break room, had breakfast, drove out to inspect a meter, went to his house where he took out his dogs, hung out for an hour, then we went back to the office, turned in some paperwork, then went out for lunch. Then we went shopping for a personal errand he had to do. Then he dropped me off at the office so I could go home." He said this is where he learned his work ethic lol.
I've worked in consulting firms where a 60-hour work week wasn't enough. We were always slammed because we never said "No" to deadlines. We had slackers who would never put in an honest 40 hour week, and others who would put in 60+hours. I would put in 50+hour weeks, sometimes working weekends, and it didn't seem enough to satisfy my supervisor. And this was a private company. It seemed like no one could get fired. I worked at another firm where the environment wasn't stressful, but it was corrupt. I don't work more than 40 hours/week currently (and I don't know anyone else here who does), but we're a private firm and we work on similar projects I mentioned above. Like I said, it's mostly management. If I have an assigned project, and I get updated info from the architect and they want it returned in 2 days, my boss literally tells them, "Tell them they can have it in a week." even if it only takes me a day to finish. And the architect is ok with it, because he knows to expect that from us. Our management makes sure no one is overloaded and everyone has time to finish their work and the PEs have time to review it. And most employees have been hear 10 years or more, so that says something.
I can see if you're getting burned out, it might be getting time to look elsewhere. I know it's hard to do, though. I've been there.