I usually clamp for 45 minutes to an hour, and have done so for 3-4 sporadic sessions so far as I've been getting used to it and trying to work it into my schedule. My natural girth is 5.35 on avg and the clamp expands me to 5.55/5.6 on a good day. Lately my erection quality is a bit lower though, probably from fatigue.
I use a folded up paper towel for a wrap for skin protection at the base. So far no skin damage. Do you wrap with anything and if so then what?
Also curious, do you have to keep stimulation to your penis to keep the expansion to the max? I do. If I sit down with the clamp on my erection decreases significantly after a few minutes, so I have to stay active with bends, squeezes, and air-humping to get my dick to shake itself/bob or swing up and down to force blood with centrifugal force. This is with the tightest grip I can get with the middle sized "Cable Clamp" - which starts out about 3-4 notches from completely closed and then ends up a max of the 2-3 to last notch.
I've never worn it for longer than an hour, but I don't take it off at all - just keep it as hard as possible. Sometimes I keep it dry, but lately I have been experimenting with masturbating with lotion and or with my [words=http://fleshlight.sjv.io/c/348327/302851/4702]Flesh Light[/words] and water based lube towards the last 15 minutes of my session. Doing something like this will be sure to aid in preventing skin dryness and it feels damn good and helps with expansion. Then I take the clamp off at that point because I'm usually very numb and lymph fluid is starting to build a bit ... and then I blow a load and call it a day - or a week ...so far. Clamping is a very sexual experience ... much different from stretching or pumping IMO. I think I might start fucking with a clamp on if I can't find a powerful enough cock ring that looks and feels good for the chick.
Do you find that the asprin helps with your erection quality? Or are you taking it to prevent something else and if so then what?