I want to increase my sex time.. what should i do for it ?

Ideas...: Use a condom. Put a little local anesthetic on your glands. For bad premature ejaculation, a low dose of a selective serotonin reuptake inhibitor can work wonders, but it's your doctor's call. Best of all, learn the squeeze technique and practice it with your partner. It's lots of fun and you'll learn to give each other much more enjoyment than even now.