Final answer:
The exact timeframe for the Ethics Officer and the Respondent to exchange witness lists before a hearing is not specified in the provided references, and it can vary by jurisdiction or case rules.
Step-by-step explanation:
The specific time before a hearing when the Ethics Officer and the Respondent have to exchange lists of proposed witnesses is not provided in the references given. This timeframe can differ depending on the jurisdiction or the specific rules of the proceeding in question. However, for illustrative purposes, let's assume a general case where the exchange is required to happen 14 calendar days before the hearing. This time allows both sides to prepare for questioning and cross-examination, as well as to plan their strategy based on the witnesses that will be presented by the opposing side.