Depends, read my comment below 💬
How much do you work every day? What does your employer demand?
Almost nobody works as long as they think they do. They're at work but they're not doing some kind of superhuman 100% productivity blast for 8 hours a day, 5 days a week. Most people have up and down days where they get a lot or a little done; and it averages out. Not to mention they have to prep for and attend meetings, take breaks to eat and so on. Working longer hours just pushes most people into the zone of diminishing returns.
Depends on the workplace.
Sometimes working 8 hours can feel like much longer, especially if your focus is low. Atm, I stay for 9h at the office and think that working for 8h is a better approach. So many of my colleagues just sit at their desk in the office because they're expected to, not because they have the focus to work effectively.
Working long hours ≠ working smart
I spend around 8.0-8.5 hours at work excluding lunch (5 days a week).
I don't feel that its impossibly demanding. I think the most productive is between 6 and 8 hours (I think research supports something in that range).
Programming in free time is more fun than at work though, and I don't have a very expensive lifestyle, so someday I'd like to work 4 days a week... 20% less money, 50% more weekend!