I never let it go that far, Twins, and I still don't. I just keep masturbating until I get good and hard and clamp at the base and keep kegeling like crazy to keep the blood flowing into my dick for as long as I can. It also helps me reach my maximum glans size: 2.25" x 2.25".
As soon as I feel like I'm going to come, I back off. I don't wait until I'm at the point of ejaculation. When it starts to flag, I start the process all over again. I keep this up for an hour or two--sometimes longer. I try to maintain this routine for a session each day for as many days in a row as I can before I have to pop--usually two to three days. It works wonders for me. It was while doing this exercise that I reached my maximum base girth: 8 inches. I actually reached that point twice.
Ballooning or edging to practice dry and multiple orgasms is another story altogether. For me, they are two separate goals and activities.
But the best multiple orgasms I've reached, by far, is with my partner. She can work me into a minute or more of them without my ever getting to the point of ejaculation.