A 10-minute presentation should have 10-14 slides.
A 15-minute presentation should have 15-20 slides.
Aiming for one slide per 45-60 seconds in your presentation allows you to be informative and professional without sharing too little or too much. The goal is to keep Goldilocks attention, focus on your message and the shared outcomes.
An additional idea which supports 45-60 seconds per slide is to present one idea per slide.
One idea per slide allows you to focus on the essential information, establish your domain expertise and transfer awareness and understanding to your audience.
However, the guideline of one slide every 45-60 seconds is not set in stone. Some slides might be fast and some slow.
A third discovery question to ask yourself is what flow and rhythm do you want to create for the audience?
Think of your favourite songs; they have loud and quiet parts, fast and slow, they take you on an emotional journey. A presentation needs to do the same.
Be intentional with your performance. Engage and inspire your audience with slides that move. If you feel confident and your message works with less or more slides, that is great. It all comes down to the most effective performance for the audience and the goals of the presentation.
Thank you.
That was helpful information.