I’ve been vacuum pumping 20 - 30 minutes, before having sex with my wife, for many years now. As a matter of fact, I pump up before having sex about 75% of the time. We both enjoy the increased size, with 6.75 inches of girth being my wife’s favorite. I’ve tried pumping for more than 30 minutes, but I get too spongy and soft. So, I always limit my pumping to no more than 30 minutes. Also, I’ve found that using a rubber cock ring keeps my erection nice and hard.
I wonder how many other guys on this forum like to pump up before sex.