... following up to myself (why not?), it's also important, I think, to resist the fallacious inference from "X loves his job" to "X would be happy to work all hours". It really does not hold up, but it's distressingly common in conversations like this to hear the proviso "well of course if you love your job you'll work the long hours and that's fine", but one could well love one's job and have other interests one also considers worth pursuing. Nothing to excess! (Plus holding the fallacious inference to be sound contributes to its pernicious contrapositive: "if you don't want to work all hours, you must dislike it here".)