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It might take a day at most if you are building the whole thing, upper and lower. But if it takes you longer than 2 hours to put the LPK in a stripped lower, you started drinking before you started. For the first time it took me under an hour and I was taking my time, checking the online guides on ar15.comA build should take a beginner a day at most with extra reading. Just save the beer for the end, after it's finished or it may take a lot longer