This is a wrong question to ask. There was no thumb rule and there cannot be any thumb rule.
How many minutes should you speak per slide is a wrong question because there is really no need to ask such a question. It does not matter. What matters is how much time you speak (all slides put together) and what you speak about.
If you have a picture on a slide, you might talk for about 1 minute on that slide. On another slide, you might have a complex table which will need a long discussion. So no thumb rule can be there.
When you are preparing for your presentation and you have been asked to present for 20 minutes, ensure you rehearse well and stick to the time limit. How much time you spent on which slide does not matter.
Nice post.
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