The National Institute of Mental Health reports that 5.7 million adult Americans -- 2.6% of the population -- suffer from bipolar disorder. Researchers also say that bipolar disorder can shave more than nine years off of someone's life. And yet, according to the Depression and Bipolar Alliance, it takes an average of 10 years for an appropriate diagnosis. In "Manic," a memoir of her life with bipolar disease, Terri Cheney explains why it can take so long.