How long does narcissistic personality last?

A narcissistic personality can last a lifetime if left untreated. Most narcissists do not realize that they have a personality disorder and will continue to live a flawed lifestyle for as long as they can sustain it. For those who seek treatment, the process can take several years because it is hard to change deeply entrenched character traits. Typically, treatment for narcissistic personality disorder (NPD) takes 5 to 10 years.

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