What is considered premature ejaculation if it generally lasts for less than a few minutes?

Patient's question:

I'm only thirty years old, and I'd consider myself physically fit, but for some reason, my performance in sexual life has always been unsatisfactory. After insertion, I finish within about five minutes. How many minutes is generally considered premature ejaculation?

Doctor's answer:

Mild Premature Ejaculation
1. During sexual activity with a partner, out of 10 attempts, 6 times fail to coordinate with the partner to control ejaculation.
2. After penetration, the time lasts for about 6 minutes but less than 15 minutes before ejaculation.
Moderate Premature Ejaculation
1. During sexual activity with a partner, out of 10 attempts, 8 times fail to coordinate with the partner to control ejaculation.
2. After penetration, the time lasts for about 2 minutes but less than 6 minutes before ejaculation.
Severe Premature Ejaculation
1. Ejaculation occurs without penetration or immediately after penetration.
2. During sexual activity with a partner, out of 10 attempts, 10 times fail to achieve ejaculation.
3. After penetration, ejaculation occurs within 2 minutes.