This is real simple go as long as you can keep starting and stopping maybe go for an hour or more and when you can't hold it any longer let go trust me orgasm is way more intense and you shoot farther this technique is an oldie but goodie
Author:SoloTouchArchive | Category: Masturbation Male Techniques

Although your oldie-but-good technique does work after a fashion, it's also stop-and-start frustrating. After all, the idea is to never ever really completely stop but to continue stroking at a slower speed while relaxing your grip. In other words, avoid getting completely to the edge of the Point of No Return. Instead, start slowing down when you feel it's within sight, but again, don't come to a complete stop and exert mind-over-body control to hold back.