A product presentation ideally lasts 60 to 90 minutes, including the live demo and a Q&A. Shorter than an hour feels too fast and incomplete for guests; longer than ninety minutes and you lose their attention.
The split that works best: ten minutes for opening and problem framing, thirty minutes of content and demo. Then ten minutes for questions and five to ten minutes for informal debrief. Also build in a small buffer for technical starts or questions that run over. Want to network afterwards? Then allow an extra thirty minutes.