Originally Posted by BobsterD
Has anyone tried pumping with an electric pump overnight?
I think that goes thought everyone’s mind at one time or another.
The problem is that after fifteen minutes to an hour, depending on conditioning and vacuum level, you’ll start developing edema - the “donut”. Lymphatic fluid fills the space between the skin and the inner penis, and there is no longer any pull for girth since the pressures are now equalized inside and outside the skin. The vacuum still pulls for length, but the skin behind the glans will be stretched as far as it will go, and when you remove the tube it will swell up more, sometimes until the swelling covers the meatus and you can’t properly urinate until the swelling goes down.
That assumes you’re using a tube that more or less fits. If you’re doing “full package” pumping you’re using a large vessel that accepts both penis and scrotum. A few men here do full package pumping, but it’s mostly done by guys who want the edema, as much as they can get, because they’re going to maximum volume while pumped, not necessarily size when not pumped. Those guys consider two or three hours to be a short pump, and often go for a full day in the jar if they have the time.