I work at Google. I get in at 8, leave at 4, because I value my family time more than my work time and it has not held me back whatsoever. Not even an eyebrow raised.
That's largely true for me as well (also Googler, albeit recent). Looking after a somewhat broader area in SRE as a manager, the one thing that makes that tricky at times is time zones of partner teams and stakeholders. I think Google does an overall good (but not perfect) job at trying to lessen the negative impact of that. There is a culture of respecting people's private time and working hours. There is certainly a culture of caring about each other's well being. (This may be biased by my org, SRE, or my office in Europe.)
