How long can a state keep you committed to psychiatric hospital?

It depends on the state and the specific circumstances of the case. In general, a state can keep a person committed to a psychiatric hospital for as long as the person is deemed to be a danger to themselves or others, or is unable to care for themselves. In most states, there are periodic review hearings where a judge will consider the person's progress and determine whether they should remain committed. In some states, a person can be committed indefinitely if they are found to be incompetent to stand trial for a crime.