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IMO, and I have no proof, I think it is all in the seal. If the seal stays pliable and in contact with the mating surface, the bearing will last as expected. If for whatever reason the seal leaks and lube can escape and contaminants enter then it will be short lived. A properly installed and properly loaded bearing failure not related to clean and plentiful lube is usually a manufacturing defect and will fail very early in its life.
In the aircraft industry, an aircraft that sits will have far more seal failures than one that is flown every day, whether they are simple O rings, garlock seals or even multi-stage lambrith seals that make almost no contact.
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