Final answer:
Members and the presiding officer can speak on a debatable appeal multiple times. The presiding officer does not need to leave the chair while speaking.
Step-by-step explanation:
The presiding officer and members can speak on a debatable appeal multiple times. The exact number of times may vary depending on the rules and procedures of the specific legislative body. However, there is typically a limit on the amount of time each speaker can take during the debate to ensure a fair and efficient process.
As for the presiding officer, it is not necessary for them to leave the chair while speaking. They can address the assembly or chamber while still presiding over the proceedings. Their role is to maintain order and facilitate the debate, so they may choose to exercise their speaking privileges from the chair itself.