Most major metropolitan areas offer inpatient or acute units for patients who are an immediate threat to themselves or others.  These units typically have an average length of stay of around 7 - 10 days and are designed to avert crisis and discharge patients as quickly as possible (as dictated by a patient's insurance plan).

Nationally, there are programs that are designed for sub-acute care, which are often locked units with milieus run by psychiatrists, psychologists, social workers, and a variety of other mental health professionals.  Sub-acute units often have a 30 - 90 day length of stay, and  have a goal of further, in-depth assessment and treatment of psychiatric and/or substance abuse issues.