Worrying about how long you will last will, more than likely, cause you to hear one of two things.
1. “What?!? You’re done already?”
2. “No, really, it’s okay…it happens to a lot of guys.”
Honestly, longevity is overrated. Two minutes of hitting the right spot

can be infinitely more pleasurable than forty-five minutes of furious thrusting.

It’s not a myth. It’s your job to find it.
If you’ve got a hot date, however, and you are really concerned, take care of business yourself. Just make sure you do it in the morning. It will help you relax, and it will help preventing hearing #2.