Final answer:
The maximum involuntary detention for individuals who have been determined to be 'gravely disabled' is four days.
Step-by-step explanation:
The maximum involuntary detention for individuals who have been determined to be "gravely disabled" is four days. If the president disputes the declaration of disability, a clock starts ticking. If within four days of the objection, the decision to declare the president disabled or incapacitated falls upon Congress. Involuntary detention refers to the act of confining an individual against their will, typically for reasons related to public safety, mental health, or other legal justifications. The specifics of involuntary detention can vary depending on the context and jurisdiction.