For my 50th birthday I made Hop 50: 50 ounces of hops in a ten gallon batch. I actually recovered about 8 gallons, losing that much to wetting the hops. It was about a 1.115 gravity triple IPA, and it came out extremely well. For my 500th batch I decided to try it again, but this time it was a “calculated” 500 ibu. Probably actually around 100 ibu if I had it analyzed, but again, came out really well. Both beers went real fast, which was a good thing. I kegged most, but made up a few bottles of Batch 500. The hops in those oxidized really fast, and after two months it was rather poor. Both batches included mash hops, first wort hops, and essentially continuous additions throughout the boil, with an emphasis on the last 20 minutes. Plus, of course, dry hops (10 ounces in Hop 50, 6 ounces in Batch 500). And yes, I’d do it again! (I have members of my club begging me to do it again!)
Usually 8-12 oz in our 5 gallon batch IPAs. It depends on what hops are being used. For us mosaic, sorachi ace, and Nelson a little can go a long way to achieve our desired flavor. 6-8 oz in the boil 5 oz of that 8 at FO/WP. Then another 3-5 oz for dry hop makes for a solid hop punch no matter what you’re using.