Final answer:
Advocates should be assigned to each complainant, alleged offender, and any witnesses within a reasonable timeframe after receiving a formal complaint.
Step-by-step explanation:
The question pertains to the assignment of advocates in response to a formal complaint in the context of complaint processing. The time frame within which advocates should be assigned to each complainant, alleged offender, and any witnesses may vary depending on the specific legal system, organizational policies, and the nature of the complaint. However, to ensure that all parties involved are adequately informed about the complaint processing, it is generally important to assign advocates within a reasonable timeframe, such as within 24 to 72 hours of receipt of the formal complaint.