Summer vacation, why so little in the US?

Since Bush is now preparing for his summer vacation (he's of course now finished with his spring vacations), I thought I would raise the issue of why US vacations are so pathetically low. Why is it that conservatives will mock Europeans who have a lot more vacations, yet none of them voice an opinion on Bush? Some estimates have Bush on vacation up to 43% of his time since coming into the White House. Others argue that once you take away weekends and visits to Camp David the percentage is actually down around 13%. If you use the low number, that's still just under 7 weeks per year. Meanwhile, Americans generally have 2 weeks per year and possibly 3 if you negotiate hard or stick around for five years. I'm not suggesting that Bush is necessarily wrong for taking seven weeks of vacation but for me, the more important question is why do Americans continue to settle for so few weeks of vacation per year? If it's good enough for the President, why not everyone else? No links, just food for thought.