In this fashion, delegates follow the actual practice employed by real diplomats. Although hard to monitor, a good conference will evaluate the performance of delegates during caucus. The chair will rule and explain. This is a difficult decision because most delegates wish to maximize their own speaking time. Sometimes, it is done as a favour to a like-minded country.
Some delegates believe that a yield to another is a sign of weakness.
You will have to determine if it fits within your overall strategy or not. Yielding one's remaining time to the chair prevents anyone from asking you tough questions, but it also indicates a weak position. Only questions on the speech are permitted. This demonstrates that the delegate is both secure and prepared to deal with harsh objections. Beware that by yielding your remaining time to questions from the floor, you allow adversaries to lead off with their own mini-speech preamble before they actually ask their question.