Not caring about work
No, it isn't that I don't care about work, but I know that work is work. I'm paid to work 37 hours a week, and while I'm happy for that to go up and down as we hit peaks and troughs, that's what I'm paid to work, that's what I consider a reasonable week's work, and so that's what I'll work. I'm just downright stubborn, I guess, but I'm quite prepared to fight the long hours culture that seems to be becoming increasingly endemic in so many workplaces. In my job, there's pretty much nothing that can't easily wait until I'm back in the office, so if I'm doing work at home it isn't because it needs to be done there and then, which means it's extra work, which means I don't need to do it.
I have quite enough to fill my free time with, without doing unpaid overtime!