this post was submitted on 14 Jun 2023
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Homebrewing - Beer, Mead, Wine, Cider
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IBU production slows down over time. There will be some increase from 60 mins to 120 but the effect will be a lot less than say 40 to 60. Not saying there isn't a difference, but that it won't be that great.
See this paper for graphs of IBU production over time of the boil. You will see that almost all of the IBU production is in the first 10-15 mins, then it slows right down.
Obviously your taste is the ultimate decider however. If you find too much bitterness then shorten the boil addition, of course. I always add a 60 minute addition, even if it's very small (5g for a 25L batch will do).