I feel extremely divided about this. I worked around 40 hours a week and feel like I'm taking away from my personal life and might even be nearing burnout at half the duration this particular peer is working. Measuring productivity on duration is silly to me, and I'd rather ascribe to the model of work where what counts most is prioritization and output. I realize there are major deadlines 2-3 times a year which may require sudden bursts of focus and attention, but that's why I would push back and reduce the time I work weekly the rest of the year.
What is the appropriate level of work/life balance expectation for a CTO for different stage startups (pre-seed, series-a, series-b, post-acquisition) and how does that differ from the expectations on the people that a CTO might manage?
Is my position on work-life balance tenable? Are there examples of successful startup founders who worked smart as opposed to long hours? Did I just land in a particular culture that is incompatible with my orientation towards productivity?