ADHD Assessment - Is it Right For You? A private assessment can last between 2 and 3 hours and includes a clinical interview with a specialist in ADHD. It is helpful to bring with you a family member or a friend to provide support, but this is not required. A https://iampsychiatry55801.bloggazzo.com/28884970/the-10-scariest-things-about-adhd-assessment-uk-private