Testing can vary depending on what the clinic offers. I was referred by my Physician Assistant to get neuropsychological testing. It was planned as a half day activity, but we went through the testing in about an hour and a half. Afterwards I had to meet again with the psychologist to review the findings. It was covered by my insurance. Typically it can be a wait to get neuropsychological testing at some places as it's in high demand. However, neuropsych testing is not very helpful in diagnosing ADHD.

The one test that they use in neuropsych testing to help with ADHD is what's called a Continuous Performance Test. This is often done on a computer and asks you to press or not press a button when a certain thing pops up on the screen. It's a few minutes long. It can sometimes be useful in catching ADHD but not always.

There are other types of testing including structured ADHD interviews, ADHD questionnaires, and comprehensive evaluations that involve gathering information from you about your history, symptoms, education, work, and other parts of life. This also may involve interviews with collateral people such as family, friends, or teachers.

Bottom line, it's probably good to ask about what type of evaluation you're being referred for. In the end the evaluation itself may not diagnose you with ADHD.

I worked with my providers for about a year and a half before they gave me the ADHD diagnosis. That was after therapy and a few medication adjustments. I'd say in general to be patient with the process, be open, and ask questions. Good luck!