It depends whether in or out of treatment, and even then it can be hard to treat sometimes. I tend to have mixed manic episodes that include extreme euphoria but also the deepest and dangerous depths of depression. Untreated they have gone on over a year. Now I’m in treatment the longest was my most recent episode which lasted nearly five months. New meds saved me. I had psychosis.

In your case another psychotic disorder might need to be ruled out before applying the Bipolar label.