Most people work around 7-8 hrs/day at big corp. It is also possible to stay inside of 15 minutes from work (A lot of Boston, Seattle people I know do this)

I know some people who go back home for a quick lunch or disappear for an hour in between. Many of these companies only care about you getting your work done and being present for all the meetings.

Ofc, there are just as many where your case applies. But, it is certainly not the norm for FAANG-eque companies