[Heaven's Night]

I'm not sure how much there is reading about vacuum pumping. Anyway, longer hours will require moderation with pressure, or alternating pressure. I'm not sure which one is really better, more hours or less hours with more pressure. I used to do both and going on crazy hours caused edge marks and discolouration which took around six months to fully heal.

But it seems I'm quite sensitive to it. I'm quite sure hormone balance changing skin quality has to do with this, anyone with T dominance is more likely to have thicker skin so likely higher pressure tolerance.