Final answer:
SAPR training should be updated at a minimum of annually to ensure current information and strategies are disseminated effectively.
Step-by-step explanation:
The minimum frequency at which Sexual Assault Prevention and Response (SAPR) training should be updated is annually. This ensures that individuals are kept up-to-date with the latest information, strategies, and protocols to prevent and respond to sexual assault. SAPR training is crucial in promoting a safe and respectful environment, especially within military and certain institutional settings where such policies are stringently enforced.