This is my 4th year in the PhD part. I used to work 10 hours a day Monday through Friday and maybe half a day each on Saturday and Sunday. My days would be pretty packed and I would be at the bench more often than in front of my computer. Now, I've reduced my work day to 9 hours during MF and maybe a quick drop in (2 hours) on the weekends. I also have less to do during the day so I'm at my desk writing a manuscript or reading some med school books to remind myself of what I've forgot. My boss tells me that I should be working harder, but I honestly don't feel like I have that much to do. I don't want to get involved in new projects because I most likely won't finish it, and I don't have the motivation to. The paper that I'm working on now would probably end up in the same journal if I had put in a lot more work into it. Does my PI have a point in that I'm slacking off, or does he simply want to get more juice out of me?