I work all the time. I wake up, start working, eat my meals at my desk, unwind at home for an hour or two before bed while answering some emails or working on my laptop, and go to sleep. The most time I spend not working is my commute (I listen to audiobooks while driving). I spent last Christmas Day and Thanksgiving Day in my lab. I have a PhD from a top school and am paid about $50000 / year because I work in Academia in a "training" (postdoc) position. The system I'm a part of is an unsustainable pyramid scheme in many ways, that I wouldn't recommend to most people, but this structural problem is hardly limited to academia. Nevertheless I'm very happy: I am intensely interested in the problem that I study (lifespan extension) and there's nothing else I'd rather be doing.