My question is what's the difference between an EDC and an EDT? (Sorry for the slight threadjack.)
Good post by Storm.
Generally, EDT has more fragrance concentration and less alcohol, thus better longevity/intensity than an EDC.
In regards to the amount of fragrance, the order is:
Aftershave - Cologne - EDT - EDP - Parfum Concentrate.
All this notwithstanding, some lower concentration fragrances last longer than some higher ones just because of the nature of certain fragrances. A common example is a light citrus-based parfum will probably not last as long as something like, oh, Ralph Lauren's Polo. This is why, even with multiple spritzes, a light cologne like Guerlain's EDC won't have the longevity of something like Old Spice cologne.