Not only that - you lose sight of the larger problems that need solving, but don't get to solve for too long that it becomes forgotten. I've worked some 30-35

Not only that - you lose sight of the larger problems that need solving, but don't get to solve for too long that it becomes forgotten. I've worked some 30-35 hour weeks at my current job, but work has been super happy with my productivity that it isn't an issue (plus I do a lot of open source work outside the job, so work still benefits from that) - occasionally I still participate in some prolonged hours due to major deadlines, but those deadlines are malleable and not prioritized over product team work-life balance. It is a refreshing contrast with the typical startup here in the Bay Area