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Would be nice to hear others experience.
Google seems remarkably fast respidering my site, usually catching textual changes within a few days at most. And I don't see a serious bandwidth issue from any spiders though I try to turn off some of the more marginal but CPU-expensive features on pages when I detect that the visitor is a spider rather than a human.
However, Google seems to be lamentably (>6 months?) behind on spidering images, which from what I hear is not untypical.