What type of speech is likely to require the least preparation time?

Impromptu speeches are characterized by their spontaneity and the requirement to speak on a topic without prior notice or preparation. This type of speech typically arises in situations where speakers must present their thoughts and ideas immediately after being assigned a topic or prompted to speak. The essence of an impromptu speech lies in its immediate delivery, which inherently means that the speaker has minimal time to prepare, as they must rely on their existing knowledge, quick thinking, and ability to organize their thoughts on the spot.

The nature and context of impromptu speeches make them a valuable skill for effective communication and leadership, as they teach speakers to articulate their ideas confidently and creatively without the advantage of meticulous planning or rehearsal.