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You'd have to take into account the fact that Blizzard has taken steps to prevent "ninja" bidding (for lack of a better term).
What this means is that if you place a bid on a nearly expired auction this will only expire normally, if no other player also bids on it within a short timeframe.
If there is a biding war happening during the closing moments of the bid the expiration time will be moved up.
This can happen repeatedly... actually it will keep happening as long as there's a biding war during the closing moments of a bid.
It's their way (I guess) to ensure that the player that is prepared to go higher gets it, and not the player lucky (or shifty) enough to place the bid at the "nick of time".
All in all, I think the bid expiration time is not as fixed as it would appear at first.
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