PowerPoint does not impose a strict character limit for speaker notes, allowing for extensive notes per slide. However, practical readability and usability during a presentation suggest keeping notes concise and focused. Excessively long notes can be cumbersome to navigate during a live presentation and may detract from the effectiveness of your speaking points. If detailed information is necessary, consider summarizing key points in the notes and referring to a detailed document or report that the audience can review after the presentation.