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At the Brew Expo last week, I really enjoyed Dogfish Head's 90 minute IPA. Tonight, as a sort of follow-up to the expo, I picked up a case of Dogfish Head's 60 minute IPA. Also delicious! This time I began to ponder about the differences between the 60 versus 90 minute beers. Of course this would have something to do with the brewing process...

From what I've read, the 60/90/120 intervals represent the number of minutes the hops are brought to a boil while hops are added. The duration of this process is what makes the beer deliciously bitter.

Once again, I visited the Dogfish Head website to discover that a 120 minute IPA also exists! The final results were staggering (and so were the tasters):

• 60 minute IPA, 6% abv, 60 ibu
• 90 minute IPA, 9% abv, 90 ibu
• 120 minute IPA, 20% abv, 120 ibu

According to BeerAdvocate.com "ibu" stands for "International Bitterness Units", and indicates the amount of bitterness in the beer. With that said, the 120 minute IPA certainly looks worth the taste. According to the Dogfish Head website, there are three limited releases scheduled for 2006, two of which are in September and October. Keep your beer sensors turned on...

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