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Could be that only a certain percent of the stock quotes are updated "quickly," but two hours after close seems inordinately long to me.

I think a more likely explanation for the discrepancies you see is after hours trading. Some outlets quote the 4PM Eastern closing price; others supply prices from after hours trading. See this short blurb from the SEC:

In short, in the few hours after regular closing, it's not at all unusual to see different quotes on the same issue. It's not that Yahoo - or Quicken, or whoever - is getting things wrong, but that they're using a different set of data. Typically, all reporting outlets will converge on a single number after a few hours.

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