I haven't seen an updated number in years but the old rule of thumb was bipolar patients where misdiagnosed on average for 8 years , but nowadays bipolar is a in vogue diagnosis, it almost seems these days to be the basic diagnosis that doctors come up with to explain what they don't know or understand and it's a winning stratedgy because bipolar is considered SMI (Serious Mental Illness) insurance pays for that and in most cases big pharma has a new friend for life , I think questioning it is healthy because there are millions of people who have been misdiagnosed by a Pdoc who had a neat little form listing the criteria for the diagnosis but the same symptoms exist in some 40 odd other conditions both physical and psychological , so a rush to judgement is often made.