My managers, and their managers, have worked longer hours than me at every job I've ever had, including retail jobs in high school, academia in grad school, and now software engineering.

Once you hit the C-Suite you don't even think about work-life balance, because your work is your entire life. I know people like that, who have enough money to retire in their 40s and live in luxury without ever working again, yet they don't want to stop working.