First of all, edging is nothing more than bringing your partner close to orgasm and stopping short of allowing him to actually ejaculate. How close you get him, and how many times you do it, will vary, but the methods are many and simple. It's like trying to ruin an orgasm and stopping too soon. That's edging!
It really doesn't matter exactly how close your partner is to ejaculation when you pause, or stop stimulating him, for a moment. The point is to NOT allow him to slip over the edge into an orgasm. Exactly how long you can stimulate him depends on several factors. The first is, how sensitive to stimulation he is. The second would be exactly what you are doing to stimulate him. And the third factor would be how much stimulation you are giving him. But the key to good edging is stopping all stimulation BEFORE it's too late.
Once you start to stimulate him, you can stop and allow him to rest for a few seconds to a minute or even more. As long as he does not ejaculate, you may then resume your stimulation of his cock. Now let's take a look at some of the most popular methods of stimulation (as if we need to).
The most commonly used method is to lubricate his cock (or your hand) really well with your favorite sex lube. Now, simply stroke his cock in whatever manner you prefer. Remember that you MUST stop before he ejaculates! I find it the most fun to use a slow, upward stroke. If you only stroke from the base to the tip of his cock, he will last longer (and so will your fun). I like to stop every few strokes, between five and ten strokes. If you are stroking both up and down, you might want to stop after only five or six strokes.
Short pauses will cause his desire and, therefore his proximity to orgasm, to increase. If you suspect that he is getting close to an orgasm, pause for a longer period, or do fewer or less stimulating strokes. You can, of course, continue to stimulate other parts of his body. Just not his cock or you will push him over the edge.
Another method of teasing his cock for edging is by touching it with only one or, possibly, two fingers at a time. This can be very frustrating. That's a good thing. Though, you might want to do some full stroking with your whole hand to get him warmed up. Use a very light touch and he will certainly last longer. I know that many of you, for whatever reason, don't want to spend a great deal of time doing this, but if you really get into his frustration and learn to enjoy it (not to mention the control you have over him at this point), you can have so much fun with edging.