Unlike (say) Amazon, Google does not require you to work long hours, and in many teams it's actively discouraged. Now of course you get some competitive types

Unlike (say) Amazon, Google does not require you to work long hours, and in many teams it's actively discouraged. Now of course you get some competitive types who like to burn the midnight oil in a mostly misguided effort to get promoted, but these are the exception rather than the rule, and Google's promotion processes are explicitly geared to attempt to reward initiative and results, not hours worked. Disclaimer: I work at Google, pretty much 9 to 5. But it's a huge company and I'm sure you can find pathological microcultures somewhere.