sometimes, it stays hard for several minutes. I will then use a cock ring and do some "clamping" and then do some slow careful jelqs, after a few minutes of this my penis head is expanded quite a bit.
other times, I'm about half erect, super thick, and I'll do about 100 jelqs. the result is my penis and head is very thick, and remains very large when I return to a flaccid size. this last 4-6 hours. after my session, I shower and many times I'm going out for the evening, and I have a very impressive pants bulge. I've always been a grower, not shower. and even tho I have a big cock, 7.25- 7.50 x 6.50 when hard, it is not that impressive when flaccid. I have had women who have known me for 30 yrs tell me they never knew I was hung. but now they been checking my bulge.
a few times, my wife has seen me getting dressed, and makes a nice compliment. and a couple times she just lays on the bed and spreads her legs, wanting and ready.
pumping results are temporary for the most part, but after awhile some of the gains become permanent. jmho