My hack at it and it seems to be accurate in the finished product. I use Beersmith 2.
I will do a hop stand at 70c for 25 minutes. I set that in the software as a Steep/whirlpool of 2 minutes.
Eg: 40lt NEIPA brew. OG = 1.065.
200g Cascade hop stand = 2.1 IBU
Loads of hop flavor with very...