It depends heavily on the job, particularly on management. I will work more if I have a selection of tasks to work on and some choice throughout the day on what to work on. This is especially true if I was part of the decision-making process that led to being assigned those tasks in the first place.

But if I have just one thing to work on, and it's something I'm not interested in and don't particularly want to work on? Yeah, probably not putting in a particularly full week.