It's finite. It's in short supply. And there's nothing we should be working harder to make the most of than this. Any idea what I'm talking about? It's time. Now, does making the most of your time necessarily mean that you ought to be taking as many vacations as you can possibly squeeze into a year? Does making the most of your time mean you should be having as many children as you can? Does making the most of your time mean you should aim to buy the best car and biggest house you can afford? If anything, such pursuits seem like they'd be an even bigger drain on your time. The question becomes: Do you think investing a lot of your time -- the scarcest commodity you have -- on these things is worth it? When it comes to travel, we spend a significant amount of time at airports, on flights, and in cabs. What's more, you have to factor all the time spent planning the vacation, including researching key sites and attractions, booking flights and tou...