Hey,

I can improve my sex time because of once I have started my sex with my partner within 1 min I have lose my stamina, please help me out and let ask about the improving my stamina...

Do you mean stamina or erection time.

Stamina ? You exercise, get enough sleep, and eat properly.

Erection time, can be other issues, have you tried masturbating first and then having sex.
Are you ejaculating or just losing the erection?