I'm calling BS on the Quora guy's statement that Google offices typically run to 8pm. They do not, by a longshot. The typical schedule was 9-6.

Now, # hours a week is a different question. Just because people leave a 6 or whatever, they often come back online at night, or work some more on weekends. That was very common.

And your last point, I honestly can't put together how you think my statement about committing code had anything to do with # of hours.