It depends on the individual office. 10am to 4pm is rare. I would say the average is 9:30am til 5:30 - 6pm. If the office is mostly middle aged people with fam

It depends on the individual office. 10am to 4pm is rare. I would say the average is 9:30am til 5:30 - 6pm. If the office is mostly middle aged people with families or it's a bigger company you see more early starts early finishes 9am - 5:30pm of for some people with kids 8am - 4:30pm. In an office of mostly younger people you see the 9:30am til 7pm+ marathons when actual work needs to get done. Because so much time is spent recovering from lunch, recovering from the hangover, waiting for coffee the long hours become necessary. A 10am start is quite uncommon, everywhere I've worked (5 different places so far) no one would look at you funny as long as you're in _before_ 10am and put in your hours but after 10am is a stretch. I also personally dislike the alcohol and coffee culture because overall it just makes you tired. It was fun in the beginning but when the real work starts to kick it is exhausting. I quit both for a month and felt a lot better for it.