Thanks. I just did a batch this weekend where I added hop extract. I guess it wasn't fully boiling because I had oil droplets on top until it started boiling and then it seemed to mix in.To ensure an excellent hot break with no boilovers, slightly more depth to the malt character, and it is a fool-proof way to make sure you're adding the hop shot to a vigorous full rolling boil, as it is intended. I also find that boiling the hops longer than one hour will start generating sharp, undesirable and unpleasant flavors. Lastly, the amount of IBUs gained at 90 minutes vs. 75 minutes vs. 60 minutes is rather inconsequential.
Interesting thanks. I just did an hour hop stand at 160F this weekend, I'm not worried about cooling quickly.I reverted back to using an ice bath in a deep stainless steel sink. Sometimes I use my chiller if its a hot day and the temperature won't budge. But I find that the ice bath works better with extended hopstands. At least for me, it ensures I'm within a target temperature range for about 20-30 minutes, and I can control the amount of ice to facilitate quicker cooling. Don't be worried if it takes 45-60 minutes to cool down. The old adage of "cooling down the wort as quickly as possible" to avoid spoilage has been busted. As long as you are careful and your process is sanitary, then you should be just fine.