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I've heard all kinds of things about how edging helps you last longer... but it's all unsubstantiated and can only really be looked at on a case by case basis. My only suggestion about it is to try it and see.
Other tips:

Try masturbating about 20 minutes before- rub the easy one out. A lot of men find that after they do that they're able to last longer.

You have fingers don't ya? And a mouth? --

And why is ejaculating quickly bad? It's not like you're out of stamina and won't bounce back. When you're having sex and you finish fast... stop with the penetrative intercourse and make your partner the center of your world. Oral, Manual stimulation, dirty talk, massage, rolling around... whatever makes them happy while also allowing you to take the spotlight off of your penis. After enough time of pleasing them your penis should be ready to go for round two.

Your cock isn't the be all end all of sex. If you want just start with making them the center of attention and FINISH with your magical 5 minutes of penetrative intercourse.