Originally Posted by jfr1111
The problem I can see with a longer boil is that you need a bigger starting volume and my setup's boil rate hovers around 13-15%. A bigger starting volume can mean a lesser gravity starting wort or bigger final efficiency. In normal/big beers, that's not a problem, since you're not likely to be extracting tannins by sparging a gallon or two more. But with something that FINISHES at 1.028 after the boil, I'd be worried that the final runnings might dip very, very low.
A solution could be to just add water to the wort before the boil. That's what they used to do with many low-gravity beers.
Of course, they'd usually be parti-gyling with the 1028 beer as the weakest of two or three.