Final answer:
Military law, specifically under UCMJ, likely establishes reasonable limits on extra duty hours as punishment. The exact number of hours may adhere to standard duty or lights out policies, but current UCMJ regulations or other relevant military policies would need to be consulted to provide an accurate figure.
Step-by-step explanation:
The student's question about soldiers performing extra duty as a punishment under the UCMJ (Uniform Code of Military Justice) pertains to the regulation of work hours during such sanctions. In the context of military law, there is an implication that such duty must be reasonable and not excessive. While the exact maximum number of hours for extra duty isn't provided in the question, it is logical that the duration should respect certain limits like standard duty hours or lights out policies.
It is important to understand that military law, like the UCMJ, sets standards to ensure discipline and order within the armed services, and this includes establishing reasonable limits on punishments like extra duty to maintain morale and effectiveness. To determine the specific answer regarding the hours limitation, one would need to refer to the current UCMJ regulations or any relevant military policy documents outlining the allowed number of hours for extra duty assignments as punishment.