Take a look at your deodorant. Mine says it's good for 48 hours. 48 hours? I take a shower at least once a day, so why would I need a deodorant that lasts longer than that? And now I find that stores offer some that last 72 hours. Does that mean I could forego washing under my arms for three days? Well, it ain't gonna happen - I'm buying the 24-hour stuff next time we shop. Sure makes one wonder, though.