Hanging more than 20 minutes

I read in some article here that a hanging session should never exceed 20 minutes. Why is that? What is wrong with hanging for an hour straight?

Hanging limits the blood flow to the penis, the more weight the less blood flow and blood delivers oxygen to the penis and if your penis gets no oxygen it dies and you will get tissue damage.

One word: Circulation

Pretty much no matter what method of hanging you choose, you are going to restrict the blood circulation to the glans of the penis which results in it getting cold and or blue and it means you are not getting enough oxygenated blood to that area. No oxygen is very bad. That is why the hanger should be removed at regular intervals to restore oxygenated blood flow.

Hmm. Sounds reasonable but I find it hard to believe that 20 minute intervalls will induce any cellgrowth. Or more correctly: i can’t see how 20 minutes would induce cellgrowth

If you want longer, take a break then resume.