Absolutely, 100%. I am hugely against working overtime and work life balance is far more important to me than many other factors. But I have worked 12 hour days and weekends few times in the past, because I felt the personal responsibility to either fix something or make sure a launch goes through smoothly. You know when I absolutely wouldn't do it though? If my manager told me that "they expect a level of sacrifice for the company". Nope. Just absolutely categorically nope. Now I'm a manager myself I would never ever ask someone to do this.