I work at a large company in NYC. Based wholly on personal observation, long hours are not uncommon. I often see folks eating dinner at the office. I suspect most people put in ~50 hours a week if not a little more than that.
The number tends to increase with the extent of one’s responsibilities (n.b. extent, not gravity).
As far as expectations go, I don’t think these are normally elaborated in terms of hours for salaried employees. You’re just expected to get your work done, regardless of whether or not it takes you more than 40. The expectation is probably that you put in ~40-50? This is purely speculation on my part, mind you.