What duration of symptoms must be observed for a hypomanic episode?

A hypomanic episode is characterized by a distinct period of elevated, expansive, or irritable mood, along with increased activity or energy that lasts at least 4 consecutive days. This specific duration is crucial because it sets hypomanic episodes apart from manic episodes, which require a longer duration of at least 1 week. Moreover, the 4 consecutive days allow for a clearer distinction in the course and pattern of mood disorders, particularly in the context of Bipolar II disorder, where hypomanic episodes are a key feature. The consistency of these symptoms over this timeframe is essential for accurate diagnosis and subsequent treatment planning.