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I've never had quite that long but not far off. .. however several people have reported 15 seconds plus once well lubricated (refer instructions )
Use 2 shells with 35% infill. Most people think more weight means a longer spin but where the weight is positioned also matters. It's also worth adding that too much weight being applied within this type of bearing increases friction / drag so there is a point where more weight works against what you are trying to achieve.
I hope this helps. ...