How many slides should be in a 20 minute PowerPoint presentation?

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2. #presentation
3. #twenty
4. #length
5. #minute
6. #about
7. #minutes
8. #other
9. #listen
10. #dictates
11. #words
12. #utilize
13. #slide
14. #presentations
15. #experts
16. #formulation
17. #powerpoint
18. #point
19. #should
20. #slides
21. #thirty