[BoyGrowingUp]

I agree, and I'm aware that the circulation is disturbed while those are on.
Therefore I am typically putting them on in the morning when going to shower, and then after brushing my teeth take them off. That gives maybe 15 min of "sucking", not more.

Thanks for the suggestion, I usually use them three or four times a week. I will take your advice of 15 to 30 minutes every day in two different periods.