I'm in Canada, so things here are a bit different. On top of that, things differ greatly between physicians.

I went into my primary care physician, and I inquired about ADHD, because I'd done some learning, and thought I had it, but didn't want to self diagnose. I thought he'd give me a referral to a psychiatrist for diagnosis, instead he gave me a survey, which was maybe 20 questions at most, took maybe a minute to fill out. After, he looked over my answers, said something to the effect of "this seems consistent with mild ADHD, do you feel it is affecting your life?" Very yes. Then he prescribed me a relatively low dose of ADHD meds, and as soon as I got that prescription filled, my life changed for the better.

I've been on it ever since and much happier for it. Took like 3 minutes at my primary care physician.

Meanwhile, my brother went to his primary, who referred him to a psychiatrist, who did weeks of discussions and examinations before any prescription was provided for him. He also has ADHD.

Different physicians, different people, different experiences.