Some men with delayed ejaculation need 30 minutes or more of sexual stimulation to have an orgasm and ejaculate. Other men might not be able to ejaculate at all (anejaculation). But, there's no specific time that indicates a diagnosis of delayed ejaculation. Instead, you are probably experiencing delayed ejaculation if the delay is causing distress or frustration, or if you have to stop sexual activity due to fatigue, physical irritation, loss of erection or a request from your partner. Often, men might have difficulty reaching orgasm during sexual intercourse or other sexual activities with a partner. Some men can ejaculate only when masturbating. Delayed ejaculation is divided into the following types based on symptoms: 
Lifelong vs. acquired. With lifelong delayed ejaculation, the problem is present from the time of sexual maturity. Acquired delayed ejaculation occurs after a period of normal sexual functioning.
Generalized vs. situational. Generalized delayed ejaculation isn't limited to certain sex partners or certain kinds of stimulation. Situational delayed ejaculation occurs only under certain circumstances.
 These categories help in diagnosing an underlying cause and determining what might be the most effective treatment.