For example in my country you go to work, eat lunch but you mostly work. In the US what I have experienced is a lot more “living” at the company and everyone stays long but people are not often actually getting work done. But staying late makes you look good. To me: if I go to work for 8h I might have 6 productive hours if even. If I would go to work for 10 hours I might not be much more productive. Problem solving sometimes involves time to come up with a solution from your subconscious (e.g. under the shower)