It's an extract kit, so I suggest following the recipe. All my extract kits have been 60 min boils also. Boil volumes are always smaller with extract brewing, but you use top off water in the carboy to bring the batch up to 5 gal. When your done with your boil and cool the wort, you add 2 gallons of fresh water to the carboy, funnel/ strain your wort into the carboy, then top off to the 5 gallon mark with more fresh water, and rock back and forth on the floor for a few min. to incorporate the top off water and aerate the beer, then pitch. Obviously all grain recipes will be different than an extract recipe as you don't have to brew the sugars out of the all grain. Extract recipes eliminates this step from the process.
I hope I answered your questin adequately, as I was a bit confused over the question.
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