Optimum point (font) sizes for text on Storyline slides

I appreciate the answer to this question may be "It all depends ..." but I was wondering whether there are optimum font sizes for Storyline slides, particularly when viewed on a computer desktop.  The templates in Slide Library have 24-28 point size for headers, maybe 18-20 for sub-headers and 12 for body text.  Has anyone experimented with the optimum sizes?

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