In my experience that if definitely higher than average but as you mention it is very individual. The good thing about the AnT (vs AeT) is that it doesn’t really require any extra interpretation. If you can go out and hold 186 for 45-60 minutes (assuming your HR monitor is working well) then that’s what it is.

30 minutes is a good place to start for sure and will give you a general idea. I like to use 45 min for folks if they are fairly well trained and 60 min if well trained. The underlying idea is you want the aerobic demand to be the main thing being tested and not blowing up before the test is over because your muscles give out. 60 min is long to to sustain a near max effort pace if youre not fairly well trained from a muscular endurance standpoint