Hello 
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Ejaculation time may vary depending on the person condition, drugs, and medical problems. If ejaculation takes >30 minutes after penetration called delayed ejaculation. 
Causes like antidepressants drugs, alcohol, stroke and 
spinal cord injury, increasing age decrease sensitivity of penis. Having a style of 
masturbation that cannot be matched by sexual intercourse - particularly a high speed, high pressure, or high-intensity form. there is no specific treatment for it just identify causative and avoid. 
Drugs with some reported benefits include:Cyproheptadine(
Periactin) - an allergy medication, 
amantadine (Symmetrel) - a Parkinson's drug, 
buspirone (Buspar) - an antianxiety medication. 
Please consult your doctor he will examine and treat you accordingly