ADHD Assessment - Is it Right For You? A private assessment could take up to 2 hours, and includes a clinical interview with an expert in ADHD. It is helpful to bring an adult family member or friend for support, but it's not required. A full psychiatric history is taken https://psychiatry96723.verybigblog.com/29402744/adhd-assessment-uk-private-it-s-not-as-hard-as-you-think