If someone were to ask you that question, what would you think? Lawyers? Turns out, the people that plug in the longest hours in the office work in marketing.

According to a new survey from U.K. recruiting firm Robert Walters, marketers rounded up the top spot for industries that work 50-plus hours a week. Coincidentally, the study also found that 57% marketers believe they need to change roles at least every three years to progress their career, so it could just be an indication of a general attitude of the field.

Who else makes the cut for working way too many hours? Rounding up the top 5 are:

1) Marketers

2) HR Professionals

3) IT specialists

4) Lawyers

5) Sales people

Overall, we’re all working longer hours than we were 2 years ago. 82% of professionals surveyed work more than 40 hours a week, up from 68% in 2011. As for those working 50-plus hours a week, that number has increased from 19% in 2011, to 28% in 2013.

Here’s the funny thing about these findings. Studies consistently show that working more than 40-hours a week is, well, essentially useless. In fact, once we cross the 40-hour mark (on a consistent basis) our productivity levels have been shown to consistently decline. There’s nothing wrong with occasionally pushing the limits on a per-project or deadline basis—I’m a huge proponent myself of working this way. It’s actually been shown to be a solid business practice when done in short stretches over a couple of weeks.

But permanently working at a faster pace doesn’t get the same returns. Working 50% more (60 hours a week instead of 40) does not result in 50% greater productivity. At best, you’ll get a 20-25% improvement in productivity.

Moral of the story? Get more done in less time, and go home early this week!