From what I've seen, graphic and Web designers are similar to how Mark is describing hours for industrial designer. It seems to depend a lot more on the age of the company and the particular project, than your own skill levels, though, for graphic or Web design. Start-ups are likely to have much longer hours, for all their employees. In general, though, it does depend most on the project you're on and the company's culture. When you start interviewing, asking about how many hours you could expect to spend per week on the particular job is a very good idea.