SimonClass,
Another sign of fatigue (and a good attachment) is a slight amount of retraction (penis is a little shorter) and feels like a rubber tube when lightly squeezed. This can happen within 6 to 10 hours. I know this sounds bad but I have researched this and it is normal. I sometimes take anti-inflamatory drugs to counteract the retraction so that I can continue to hang the next day. You should not get retraction all of the time as I think this can stall gains and prevent you from being able to hang. It is just an indicator that you are straining the tunica and ligaments and lets you get an idea what weight, times, and numbers of set you need to be doing to achieve fatigue. You need to walk a fine line there so that you can continue to hang comfortably. Test it every month or so and adjust your workout accordingly.
As far as always hanging for 20 minutes. If your glans in not getting hard and dark then you probably have a good attachment. If you are conditioned (6 weeks of hanging minimum) then you might want to increase the weight by 1 1/4 lbs every 2 or 3 workouts, but no more than 5 lbs per week, until you find the weight were you cannot hang for 20 minutes. I personally have started to move away from the 20 minute limit and instead I a shoot for 12 to 15 minutes. Long story as I have tried heavy, very heavy, light and now heavy BTC. I am a hard gainer and I may have gained all that I am going to gain. I keep trying to find the magic bullet and it seems that there is always another twist that needs to be tried.
I recently have begun heavy hanging with what I call strict BTC. I am trying to follow Bibs recommendations to a tee. I am also doing clamping in the AM and PM combined with careful erect bends (I have a very tough dick). I have been measuring more girth as of late but I am not going to post it to my stats until I am sure that it is cemented. I did some math and determined that on me, 1/4 inch of girth gains equate to almost 1 1/2 inches of length. I am wondering if somehow girth can eventually convert to length. With so many people here focused on gaining length first I am willing to see if there is a benefit to work both at the same time. I have nothing to loose at this point as my length gains seem to be stalled.
sheLovesIt