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@Fox
Lots and lots! Ha ha.
From my research the precision rating of the bearings probably has more effect than ceramic or not, although ceramic should definitely last longer (which would be my priority if they didn't cost so much).
From what I gathered anything 5 or above on the [ame="http://en.wikipedia.org/wiki/ABEC_scale"]ABEC scale[/ame] is more than good enough for bike use.