There are times when individuals speak over and over on one debatable issue, even if their meeting rules of order follow Roberts Rules of Order. ( Sometimes Board Chairs do not realize that, according to Roberts Rules there is a defined amount of time and amount of times a Board Member may speak)
So, referring to Roberts Rules of Order, 10th ed page 375 the following applies:
You may speak in debate on any debatable motion on the same day. Each of these 2 times, you can speak up to 10 minutes. You cannot ‘save’ time or transfer it to someone else.
Note: Some organizations have made special privileges within their bylaws to expand upon the amount of times an individual may speak on one subject. This special privileges inserted into bylaws is really quite rare.