I am put together a grain bill to clone Lakefront IBA. I went off the data sheet from the all grain kit sold on NB. It states in the data sheet "Lakefront recommends a 90 min boil for this recipe, making the first hop addition with 60 min remaining". The hop bill for this is 1 oz. Columbus (60min), .66 oz. Cascade (20min), 1.33 oz. Cascade (5min), then Dry Hop for 7 days with .5oz Centennial, 1 oz. Cascade and .5oz. Columbus.