I agree, its important to at least factor it in. Boil time is an important part of a recipe. Some of my recipes have 60, 75, and 90 minute boil times and I have good reason for them. If you want to shorten the boil time, you need to make other adjustments like water amounts, hop additions etc. Even then it won't taste QUITE the same. Color, flavor, bitterness are the factors most involved.