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The time between the shifts in polarity varies and we're not exactly sure why. It can be as long as 40 million years between shifts or as short as a few hundred years. The last polarity shift was about 780,000 years ago. Some scientists think the polarity will shift again in the year 2012. That is part of the basis for some of the doomsday prophecies about the end of the world coming next year. We know that some planets have had catastrophic events that could have involved polarity shifts; however, it is unlikely that the Earth will suffer much from these changes. We know that the polarity has flipped before, so it is unlikely to be the end of the world as some claim. Although you could average together the times the polarity has shifted, it wouldn't give you a very accurate idea of the process. The polarity changes occur at such different time intervals that an average really wouldn't be helpful in this situation.
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