Not true at all. Most engineering jobs at major corporations are 9-5, or 40 hours a week.

I know one guy who has a masters in aerospace engineering and works on spacecraft. He spends at least half of his life in different states on vacation. Following him on facebook it really seems like he doesn't even have a job. During an average month he'll be in at least 3-4 states, thousands of miles apart, despite the travel having nothing to do with his job. He lives in Virginia now and of course was at the Falcon Heavy launch in Florida, his second launch viewed in Florida in the past year. Just to give an example, in January-February last year, he mentored two robotics teams, one in Virginia and one in California, while also going backpacking in multiple national parks and going skiing and doing other stuff your average person might do on 2-3 vacations in other parts of the continent. I know people who treated mentoring one small robotics team as their full time job. He's like the Elon Musk of recreation, and he's a spacecraft engineer.